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': 'Weber Fechner law is related with \nSelect and explain. \nA. Amplitude, B. Surface area, C. Number of sensory fibre involvement, D. Stimulus discrimination', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The magnitude of the sensation felt is proportional to the log of the intensity of the stimulus strength.', 'role': 'assistant'}]