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': 'Sarcomere is between: \nSelect and explain. \nA. Two adjacent M lines, B. Two adjacent Z lines, C. Two adjacent H lines, D. Two adjacent I bands', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The light I band is divided by the dark Z line, and the dark A band has the lighter H band in its center. A transverse M line is seen in the middle of the H and, and this line plus the narrow light areas on either side of it are sometimes called the pseudo-H zone. The area between two adjacent Z lines is called a sarcomere.', 'role': 'assistant'}]