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
Which of the following exposure carries the maximum risk of transmisstion of HIV - 
Select and explain. 
A. Sexual intercourse, B. Blood transfusion, C. Trans-placental, D. Needle prick
B: Blood transfusion
Answer: B: Blood transfusion 
Explanation: None