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': 'Platysma \nSelect and explain. \nA. Compresses the cheeks, B. Draws the angles of mouth downwards, C. Elevates the mandible, D. Helps in mastication', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]