When a B cell is exposed to an antigen for the first time

When a B cell is exposed to an antigen for the first time mcq given below:

Q. When a B cell is exposed to an antigen for the first time

(a) the primary response occurs
(b) the primary response takes 1-3 hours to become effective
(c) B-cell divides to from plasma cells and T helper cells
(d) the B memory cells produce antibodies

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Ans:(a) the primary response occurs

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