TASK DEFINITION: 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.
PROBLEM: Where does the earth's magnetic field originate?

SOLUTION: Earth's core

PROBLEM: Are radio waves electromagnetic waves or sound waves?

SOLUTION: electromagnetic waves

PROBLEM: Who was at the helm of the national negro congress that convened in chicago in 1936?

SOLUTION:
Asa Philip Randolph