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': 'Intensity of sound is measured in: \nSelect and explain. \nA. Diopters, B. Daltons, C. Decibels, D. Pounds', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]