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': 'Person wakes up with pain, paresthesia, tingling of the arms. He had slept with arm below the head. Which fibres are involved? \nSelect and explain. \nA. Type A fibres, B. Type B, C. Type C (pain), D. Type C (postganglionic)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pressure on a nerve cause loss of conduction in large diameter motor, touch and pressure ie type A fibre while pain fibre c remains intact. Ref: Ganong&;s review of medical physiology; 23rd edition; pg:89.', 'role': 'assistant'}]