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: Dental
[{'content': 'Pulpal pain response is \nSelect and explain. \nA. dull and throbbing when carried by myelinated C fibers., B. dull and throbbing when carried by unmyelinated C fibers., C. quick and sharp when carried by myelinated C libers., D. quick and sharp when carried by unmyelinated C fibers.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]