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': 'In muscle contraction all of the following occurs except \nSelect and explain. \nA. Z-lines become closer, B. H zone diappears, C. A band shortens, D. M line becomes more prominent', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In muscle contraction\n\nZ-line become closer\nSarcomere shorten\nA-band remains unchanged\nH-zone disappears\nI-band shortens\nM line becomes more prominent', 'role': 'assistant'}]