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: Surgery
[{'content': 'You are testing knee jerk reflex in a patient. The afferents in deep tendon reflexes are carried by: \nSelect and explain. \nA. Dynamic intrafusal fibers, B. Golgi tendon organ, C. Nuclear bag and static chain fibers, D. Both Golgi tendon and muscle spindle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Dynamic intrafusal fibers', 'role': 'assistant'}]