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: Social & Preventive Medicine
[{'content': 'Highest yield for parasite in case of Kala azar is obtained on: \nSelect and explain. \nA. Bone marrow aspiration, B. Splenic tap, C. Peripheral smear, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Splenic aspiration is one of the most sensitive and widely used procedure and sensitivity may be as high as 95-97%. As a prerequisite for deciding splenic aspiration it is essential to determine prothrombin time and platelet count. If the prothrombin time is more than 5 seconds longer than the control sample and the total platelet count is less than 40000/cu.mm the splenic aspiration is contraindicated. Ref:', 'role': 'assistant'}]