IgM appears in fetus at what gestational age -

IgM appears in fetus at what gestational
age -
a) 10 weeks
b) 20 weeks
c) 30 weeks
d) at birth
Correct Answer - B
Ans. is ‘b’ i.e., 20 weeks
IgM is the earliest immunoglobulin class to be synthesized by the
fetus, beginning at 20 weeks of age.