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.

Who was the pale rider supposed to be?
Thanatos

Who sang my heart beats like a drum?
A Touch of Class

When did the us start issuing social security numbers?

November 1935