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': 'Slow pain in nerves is carried by \nSelect and explain. \nA. a (alpha), B. b (delta), C. B, D. C', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) C > Sense organs for pain are free nerve ending found in almost every tissue of the body> PAIN PATHWAY> VPN thalamus Ad(myelinated)... fast pain> DRG> C (unmyelinated)... slow pain dorsal root> Substance P is mediator of pain', 'role': 'assistant'}]