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: Medicine
[{'content': 'Sternal puncture is done at which site \nSelect and explain. \nA. Junction of upper and lower half of body, B. Upper pa of manubrium, C. Lower pa of manubrium, D. Just above xiphisternum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer-B. Upper pa of manubriumSternal punctureManubrium sterni is the preferred site for bone marrow aspiration because it is subcutaneous and readily accessible.The bone marrow sample is required for haematological examination. A thick needle is inseed into the upper pa of the manibrium to avoid injury to arch of aoa, which lies behind the lower pa.', 'role': 'assistant'}]