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: Pathology
Antigen absent in Bombay blood group- 
Select and explain. 
A. H, B. A, C. B, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., H; 'b' i.e., A & 'c' i.e., B"Bhende et al (1952) from Bombay repoed the very rare instatnce in which A and B antigens as well as the H antigens are absent from red cells. This is known as Bombay or OH blood"