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: Pathology
[{'content': 'During lactation, uterine smooth muscles show \nSelect and explain. \nA. Hyperplasia, B. Hypertrophy, C. Involution, D. Atrophy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]