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 deep to: \nSelect and explain. \nA. Infratemporal region, B. Submandibular region, C. Sternomastoid muscle, D. Diagastric triangle", 'role': 'user'}, {'content': "Answer: C \nExplanation: Bezold's abscess is an abscess deep to the sternocleidomastoid muscle where pus from mastoiditis erodes through the coex of the mastoid pa of the temporal bone, medial to the attachment of sternocleidomastoid, extends into the infratemporal fossa, and deep to the investing layer of the deep cervical fascia.", 'role': 'assistant'}]