This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Tapping the tendon of a muscle may elicit? \nSelect and explain. \nA. Contraction of the muscle, B. Relaxation of the muscle, C. No response, D. Fibrillation of the muscle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Contraction of the muscle # Tapping the patellar tendon elicits the knee jerk, a stretch reflex of the quadriceps femoris muscle, because the tap on the tendon stretches the muscle> Tapping on the tendon of the triceps brachii, for example, causes an extensor response at the elbow as a result of reflex contraction of the triceps;> Tapping on the Achilles tendon causes an ankle jerk due to reflex contraction of the gastrocnemius;> Tapping on the side of the face causes a stretch reflex in the masseter', 'role': 'assistant'}]