Question

Assertion [A]: Preparation of vaccine for malaria is very difficult.
Reason [R]: Plasmodium keeps changing its surface antigens from time to time.

• A. A and R are true. R is the correct explanation for A.
• B. A and R are true. R is not correct explanation for A.
• C. A is true. But R is false.
• D. A is false. But R is true.

Hint:

The difficulty in developing vaccines for diseases like malaria is often due to antigenic variation in pathogens.

Answer 1

The Correct Option is A

The assertion that preparing a malaria vaccine is difficult is true due to the complex life cycle of the parasite.
The reason is also true as Plasmodium constantly changes its surface antigens, making it difficult for the immune system to respond and for vaccines to be effective. Thus, R provides the correct explanation for A.
Final Answer:
A and R are true. R is the correct explanation for A.