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: ENT
[{'content': "Bezold's abscess is located in - \nSelect and explain. \nA. Submandibular region, B. Sternomastoid muscle, C. Digastric triangle, D. Infratemporal region", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]