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: Anatomy
[{'content': 'Muscle, which is anatomically a back muscle, but functionally related to thorax is: \nSelect and explain. \nA. Rhomboid, B. Latisimus dorsi, C. Trapezius, D. Levator costae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Lattisimus dorsi Muscle, which is anatomically a back muscle, but functionally related to thorax is Latisimus dorsi. The latissimus dorsi muscle is the widest muscle on the back though it mostly acts as a shoulder muscle.', 'role': 'assistant'}]