This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Stimulus for stretch reflex \nSelect and explain. \nA. Passive stretch, B. Active stretch, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching by increasing its contractility as long as the stretch is within physiological limits. (Ref: <a href="', 'role': 'assistant'}]