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': 'Which muscle divides the neck into anterior and posterior triangles? \nSelect and explain. \nA. Sternomastoid, B. Platysma, C. Digastric, D. Trapezius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]