You will be given a definition of a task first, then some input of the task.
Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Fact: A molecule of carbohydrate or protein molecule the immune system recognizes as foreign to the body. 
Question: What are molecules that the immune system recognizes as foreign to the body?
Output:
Carbohydrates, or proteins.