Question

The four blood groups in humans are

• A. A, B, C, and D
• B. A, B, AB, and C
• C. A, B, AB, and O
• D. A, B, AB and OO

Answer 1

The correct option is C

A, B, AB, and O

The correct answer is A, B, AB, and O.

The explanation for a correct answer

The scientist Karl Landsteiner identified four blood groups in the year 1900.

1. The blood group of a person with antigen A on their RBCs is A.
2. The blood group of a person with antigen B on their RBCs is B.
3. The blood group of a person with neither antigen A nor antigen B on their RBCs is O.
4. The blood group of a person with both antigen A and antigen B on their RBCs is AB.

The correct answer is option C i.e. A, B, AB, and O.