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 does the voice for johnny's dad in sing?
Peter Szymon Serafinowicz

Where is the descending aorta located in the mediastinum?
posterior mediastinal cavity

When did the rock and roll hall of fame open in cleveland ohio?

September 1, 1995