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
The maintenance of posture in a normal adult human being depends upon 
Select and explain. 
A. Integrity of reflex arc., B. Muscle power., C. Type of muscle fibres., D. Joint movements in physiological range
A: Integrity of reflex arc.
Answer: A: Integrity of reflex arc. 
Explanation: (A) Integrity of reflex arc.