Which of the following antibody is the first line of defence against inhaled and ingested pathogens?(a) IgM(b) IgA(c) IgG(d) IgEThe question was asked in a job interview.My doubt is from Human Health and Disease in portion Human Health and Disease of Biology – Class 12

Which of the following antibody is the first line of defence against i

1.	Which of the following antibody is the first line of defence against inhaled and ingested pathogens?(a) IgM(b) IgA(c) IgG(d) IgEThe question was asked in a job interview.My doubt is from Human Health and Disease in portion Human Health and Disease of Biology – Class 12
Answer» Correct option is (B) IgA For explanation: IgA ANTIBODY is the first line of defence against inhaled and INDIGESTED pathogens because it is present in cell secretions like milk, saliva, MUCOUS ETC. It is also found in Colostrum.

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