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': 'Vanilloid receptors are activated by: \nSelect and explain. \nA. Pain, B. Vibration, C. Touch, D. Pressure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Pain', 'role': 'assistant'}]