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.

Example Input: What branch of biology creates models to make whole biological systems understandable?
Example Output: computational systems biology, systems biology and mathematical biology

Example Input: Who played uncle arthur in the comedy company?
Example Output: Glenn Robbins

Example Input: Who played spike in christmas with the kranks?
Example Output:
Erik Per Sullivan