instruction:
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.
question:
Who plays alex von strucker in agents of shield?
answer:
Spencer Treat Clark


question:
Who played robin's mother on how i met your mother?
answer:
Tracey Ullman


question:
The unit of energy used to quantify the amount of energy in food is?
answer:

calorie