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': 'Muscle spindle \nSelect and explain. \nA. Receptor for stretchreflex, B. Antigravity muscle, C. Multisynaptic reflex, D. Excited by strech and contraction of muscle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Muscle spindles are receptors of stretch reflex or monosynaptic reflex.(Ref. Textbook of physiology N Geetha 2nd edition page no.514)', 'role': 'assistant'}]