Q. Consider the following statements:

1. The most common blood group is O(+).
2. The rarest blood group is AB(-).
3. O(-) group is the universal donor.
4. AB(+) group is the universal recipient.

Which of the above statement(s) is/are correct?
Answer: All of them
Notes: O positive (O+) is the most prevalent blood group worldwide, while AB negative (AB-) is the rarest. O negative (O-) blood can be given to any blood group, making it the universal donor. AB positive (AB+) individuals can receive blood from any group, and are the universal recipients. Thus, all four statements are correct.