This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Knee jerk is an example of: \nSelect and explain. \nA. Monosynaptic reflex, B. Polysynaptic reflex, C. Withdrawal reflex, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: The stretch reflex is the best known and studied monosynaptic reflex and is typified by the knee jerk reflex. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 9.", 'role': 'assistant'}]