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': 'Among the following nerve fibres the one with lower conduction velocity is: \nSelect and explain. \nA. A alpha, B. A beta, C. A gamma, D. C', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Velocity of conduction in a nerve is affected by myelination, diameter, capacitance and resistance. Velocity is directly propoional to degree of myelination, diameter and capacitance and inversely propoional to resistance. C fibres are unmyelinated hence it will have the lower conduction velocity compared to myelinated A and B nerve fibres. Ref: Ganongs, review of medical physiology, 21st Edition, Page 60', 'role': 'assistant'}]