A. similar antigens and antibodies
B. contrasting antigens and antibodies
C. two different antigens
D. two different antibodies
E. white blood cells from the two individuals.
Correct Answer:
Option B – contrasting antigens and antibodies
Explanation
AGGLUTINATION TABLE
| Blood group
(ABO system) |
Anti- A serum | Anti- B serum |
| A | Clumping | No clumping |
| B | No clumping | Clumping |
| AB | Clumping | Clumping |
| O | No clumping | No clumping |
Note that the contrasting antibodies clump, as well as the contrasting antigens.
