This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic and operative ENT, Subject name: ENT
[{'content': 'Tracheostomy done at which level \nSelect and explain. \nA. T1, B. T3, C. T4, D. T5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A 2-3 cm veical or horizontal skin incision is made midway between the sternal notch and thyroid cailage . It&;s a Open surgical technique. Ref- Dhingra 6th edition, page 317.', 'role': 'assistant'}]