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': 'The parotid duct can be palpated when - \nSelect and explain. \nA. Angle of the mandible is depressed, B. Anterior margin of the masseter is tensed, C. Posterior margin of the masseter is relaxed, D. Through the buccal mucosa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Parotid duct can be palpated at tense anterior margin of masseter muscle.', 'role': 'assistant'}]