In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Ex Input:
When did the drummer of def leppard lose his arm?

Ex Output:
31 December 1984


Ex Input:
Where does the ulna articulate with the humerus?

Ex Output:
semilunar notch


Ex Input:
A financial instrument whose value is derived from the value of an underlying asset is called a?

Ex Output:

derivative