Teacher:Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.
Teacher: Now, understand the problem? Solve this instance: Question: Are increased levels of basic fibroblast growth factor found in the cross-clamped heart during cardiopulmonary bypass?
Answer: Plasma bFGF levels increase during cardiopulmonary bypass. The source of this elevation is the lungs and heart.
Student:
yes