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
In the heterosexual transmission (from infective to non in fective paner) of Human Immuno-deficiency Virus infection (HIV)- 
Select and explain. 
A. There is a greater risk of transmission from man to a woman, B. There is greater risk of transmission from woman to man, C. Risk is equal either ways, D. HIV infection is not transmission by heterosexual act
A: There is a greater risk of transmission from man to a woman
Answer: A: There is a greater risk of transmission from man to a woman 
Explanation: A European study of heterosexual couples in suggests that chances of transmission of HIV infection from male to female is twice as likely as from female to male. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 364