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: Unknown
[{'content': 'Carina is situated at which level - \nSelect and explain. \nA. T3, B. T4, C. T6, D. T9', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B', 'role': 'assistant'}]