Assertion (A): IgG is the most abundant immunoglobulin in serum.
Reason (R): IgG can cross the placenta and provide passive immunity to the fetus.
1
Both A and R are true, and R is the correct explanation of A
2
Both A and R are true, but R is not the correct explanation of A
3
A is true, but R is false
4
A is false, but R is true