This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following exposure carries the maximum risk of transmission of HIV - \nSelect and explain. \nA. Sexual intercourse, B. Blood transfusion, C. Trans-placental, D. Needle prick', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HIV transmission Route of Transmission Percentage of total cases Efficiency of route Sexual 87 0.01-1% Blood and blood products 01 >90% Sharing needles/Synringes 02 0.3% Mother to Child transmission 05 30% Ref : park 25th edition Pgno : 364', 'role': 'assistant'}]