Question

Match the following antibodies with their correct description:

Antibody	Description
P. IgE	(i) Cross the placenta
Q. IgG	(ii) Dominant antibody produced in immune responses
R. IgM	(iii) It is found in the mother's milk
S. IgA	(iv) Responsible for autoimmune responses including allergies

• A. P(i), Q(iii), R(ii), S(iv)
• B. P(i), Q(ii), R(iii), S(iv)
• C. P(iv), Q(ii), R(iii), S(i)
• D. P(iv), Q(i), R(ii), S(iii)

Answer 1

The Correct Option is D

Instead of checking each combination, it's quicker to fix the description of each antibody first and then read off the matching option. IgE is the antibody class implicated in allergic and autoimmune hypersensitivity, so P matches (iv). IgG is the only antibody specifically transported across the placenta, so Q matches (i). IgM is a pentamer that appears earliest and in the largest amount during an immune response, making it the dominant antibody, so R matches (ii). IgA is secreted at mucosal surfaces and is the antibody present in mother's milk, so S matches (iii).

Putting these together gives P(iv), Q(i), R(ii), S(iii), which is exactly the fourth listed combination.

Therefore, the correct answer is P(iv), Q(i), R(ii), S(iii).