Discussion
Assertion (A) : There is no vaccine for AIDS.
Reason (R) : The AIDS virus changes its genetic code
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
HIV mutates rapidly, particularly in the surface proteins a vaccine would have to target, so no vaccine has been able to keep pace with the strains in circulation. The changing genetic code is the very reason no vaccine exists. Both are true and R explains A.
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