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': 'The maintenance of posture in a normal adult human being depends upon \nSelect and explain. \nA. Integrity of reflex arc., B. Muscle power., C. Type of muscle fibres., D. Joint movements in physiological range', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Integrity of reflex arc.', 'role': 'assistant'}]