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: Physiology
[{'content': 'Repetitive stimulation increases pain sensation, The probable cause is: \nSelect and explain. \nA. Hyper-sensitization, B. Decreased reflex time, C. Increase in threshold of pain, D. Decreased receptor area', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Hyper - sensitization', 'role': 'assistant'}]