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': "What is true regarding the gamma efferent neuron? \nSelect and explain. \nA. An 'A' group motor neuron with a smaller diameter than that of alpha efferent neurons, B. Innervates intrafusal fibres, C. Innervates muscle fibres that stretch annulospiral bulbar endings, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: (D) All of the above # SPINDLES have motor nerve supply of their own and these nerves constitute about 30% of fibers in ventral roots, and belong in Erlanger and Gasser's A g group.> Because of their characteristic 3-6 mm diameter in size or called g efferents of Leksell or small motor nerve system.> Larger b motor neurons innervate both intrafusal and extrafusal fibers.", 'role': 'assistant'}]