This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Which type of motor unit is of prime impoance in generating the muscle power necessary for the maintenance of posture? \nSelect and explain. \nA. Low threshold, fatigue-resistant, B. High threshold, fatigable, C. Intrafusal, gamma controlled, D. High threshold, high force', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The low threshold for activation, fatigue-resistant motor units are the type active in postural control. Intrafusal muscle fibers do not contribute to force generation.', 'role': 'assistant'}]