What is a Bismarck?

Answer 1

It's many things.

1. a famous German political family. Notably, the first chancellor of unified Germany, Otto Von Bismarck, nicknamed the "Iron Chancellor". Some of his descendants are still involved in German politics.
2. a German battleship from World War II, named after Otto von Bismarck. It was one of the largest battleships ever built, but was hunted down and sunk by the British Navy.
3. in parts of the US and Canada, it's a kind of jelly donut
4. an alcoholic drink made from a mix of dark beer and champagne, which Otto reportedly loved.
5. the name of several cities, notably the capital of the US state of North Dakota. Most of these are also named after Otto.

Answer 2

A bismarck is one of several types of dessert pastry.