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
Among the following nerve fibres the one with lower conduction velocity is: 
Select and explain. 
A. A alpha, B. A beta, C. A gamma, D. C
D: C
Answer: D: C 
Explanation: 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