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 is not anterior triangle of neck: \nSelect and explain. \nA. Digastrics, B. Subclavian, C. Carotid, D. Submental', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]