This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'In dark adaptation, there occurs \nSelect and explain. \nA. Decreased perception of vision, B. Decreased visual acuity, C. Pupillary dilatation, D. Breakdown rhodopsin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dark adaptation The physical and chemical adjustments of the eye, including dilation of the pupil and increased activity of rods in the retina, that make vision possible in relative darkness.Ref: Ganong&;s review of medical physiology, 23rd edition Page no: 171', 'role': 'assistant'}]