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
Knee jerk is an example of: 
Select and explain. 
A. Monosynaptic reflex, B. Polysynaptic reflex, C. Withdrawal reflex, D. None of the above
A: Monosynaptic reflex
Answer: A: Monosynaptic reflex 
Explanation: 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.