This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
[{'content': 'Posterior boundary of Carotid Triangle is formed by \nSelect and explain. \nA. Superior belly of omohyoid, B. Posterior belly of digastric, C. Sterno hyoid, D. Sternocleido mastoid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Boundaries of carotid triangle IN FRONT & ABOVE- Post Belly of Digastric and Stylohyoid Muscle. IN FRONT & BELOW- Superior Belly of Omohyoid. BEHIND- Anterior Border of SternoCleidomastoid.', 'role': 'assistant'}]