Question

Given below are two statements :
one is labelled as
Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
IgG is the first immunoglobulin produced during a primary immune response.
Reason (R) :
IgM has a pentameric structure that allows efficient activation of the complement system.
In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Remember:
• IgM \(\rightarrow\) First antibody in primary response
• IgG \(\rightarrow\) Most abundant antibody in secondary response \[ \text{IgM pentamer} \Rightarrow \text{Efficient complement activation} \]

Answer 1

The Correct Option is D