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: Anaesthesia
[{'content': 'Allodynia is \nSelect and explain. \nA. Feeling pain without stimulus, B. Feeling pain to a normal non painful stimulus, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]