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 did shane harper play in high school musical 2?
a dancer

Who played guitar on two tickets to paradise?
Jimmy Lyon

What is the body natural version of morphine?

endogenous opioid peptides