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: 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 fibers, D. Joint movements in physiological range', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Integrity of Reflex arc\'Postural Reflexes not only maintain the body in an upright balanced position but also provide the constant adjustments necessary to maintain a stable postural background for voluntary activity\'- Ganong 22"V207Integrity of the postural reflex arc is therefore the single best answer of choice.', 'role': 'assistant'}]