This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Exposure of left subclan aery by supraclavicular approach does not require cutting of \nSelect and explain. \nA. Sternocleidomastoid, B. Scalenus anterior, C. Scalenus medius, D. Omohyoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Scalenus medius is located posterior to the subclan aery. Hence there is no need to cut this to expose the subclan aery. Ref - Bdc 6th e Vol 3 pg165,166 , pubmed.com', 'role': 'assistant'}]