instruction:
Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
question:
statement: caffeine is psychoactive, question: What is caffeine?
answer:
psychoactive


question:
statement: a directory of the types of hemoglobin in the family tree is a useful tool for studying inheritance patterns, question: What is a useful tool for studying inheritance patterns?
answer:
hemoglobin


question:
statement: All cells have cellular matter inside the plasma membrane., question: What membrane does all cells have cellular matter inside?
answer:

plasma