The Only One, Part 2 by Egantx7

What is the title of the only opera composed by Beethoven?

Which mountain is the only member of the Seven Summits (whichever version you read) that is not a part of any mountain range?

While the British Navy lost more ships and men, the German inability to clear the British fleet resulted in a net loss for Germany, which kept the rest of its fleet bottled up after this battle. The British fleet was led by Jellicoe and Beatty, both of whom fell under heavy criticism for not crushing the German fleet. Identify this 31 May-1 June 1917 naval battle, the only large scale naval battle of World War I, which took place off the Danish coast in the North Sea.

What is the only dwarf planet to have been discovered before the 20th century, and the only dwarf planet to have an orbit entirely smaller than Neptune's?

There are 20 performers who have had credited roles in films that won back-to-back Best Picture Oscars ... but only one woman has done this. Who is the only woman to have credited roles in back-to-back Best Picture Oscar winners, doing it for films released in 1978 and 1979?

Which nation is the only double-landlocked nation in Asia (double-landlocked means bordered only by nations which are themselves landlocked)? Timur (or Tamerlane) was born in this modern nation located on what is barely left of the Aral Sea's southern coast.

This man was issued US patent #6469 for a device which was used for Buoying Vessels Over Shoals. While a practical version was never built, identify the future president to whom this patent was issued; the only president to have ever had a patent issued to them.

Who is the only Major League pitcher to throw more than three no-hit complete games in the National League?

What is the only television series to have premiered on the FOX network that is older than The Simpsons (at least by a few months)? This cinéma vérité series is now on the Spike network. (edited at 2:56 pm, May 22, 2016 (PDT))

Who is the only person to have won a Nobel Prize for Literature (1925), and an Oscar for Best Screenplay (Pygmalion in 1938)?

Which group of subatomic particles (according to the Stanard Model) are the only group of particles to participate in all four of the fundamental force interactions in nature, as well as the only confirmed particles to have electric charges which are non-integral multiples of the elementary charge value.

In 2014, the wolf population in this national park had dropped to two, an alarming development since observations of the wolf and moose populations in this national park had been one of the longest ongoing population studies at 55 years. This national park consists of over 400 islands in Lake Superior, and is named for the largest of those islands, which despite being much closer to Minnesota, is a part of Michigan. Identify this national park, the only U.S. national park to be completely closed during the winter season.