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: Microbiology
Which of the following has the highest chance of transmission of HIV? 
Select and explain. 
A. Anal intercourse, B. Transfusion of blood products, C. Kidney transplant, D. Transplacental transmission
B: Transfusion of blood products
Answer: B: Transfusion of blood products 
Explanation: The approximate chance of infection/exposure is given below of various scenario a) Sexual intercourse i.e oral, anal or vaginal : 0.1 - 1.0 % b) Blood and blood product transfusion : >90% c) Tissue and organ donation : 5 to 90 % d) Sharing needles by drug addicts : 0.5 - 1.0 % e) Mother to baby : 30 % Ref: Textbook of microbiology By Ananthanarayanan, 6th Edition, Page 551