IgA___
Q. IgA
A. crosses the placenta
B. is involved in hay fever
C. is present in saliva and milk
D. activates complement by the classical pathway
Answer: is present in saliva and milk
A. crosses the placenta
B. is involved in hay fever
C. is present in saliva and milk
D. activates complement by the classical pathway
Answer: is present in saliva and milk