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': 'Which of the following nerve fibres serve as preganglionic autonomic fibres \nSelect and explain. \nA. Aα, B. Aγ, C. B, D. C', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]