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: Pathology
[{'content': 'Pain due to stimulus non- painful stimulus that does not normally produce pain is called: \nSelect and explain. \nA. Allodynia., B. Hyperalgesia., C. Hyperasthesia., D. Hyoerpathia.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]