Instructions: 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.
Input: Question: Does knee ligament behavior following a controlled loading protocol differ by menstrual cycle day?
Answer: Following a controlled, static external load, displacement and stiffness were not affected differently by day of the menstrual cycle.
Output:
no