An 'antigen' is
That which acts with plasma
That which opposes the action of antibody
The stimulus for antibody production
The antibody only
It’s obvious.
Definitions / Explanation : Active immunity & Passive immunity
The immune system which works against self is
What is Active immunity and Passive immunity ?
The thymus is a lobed organ located near the $…A…$ and beneath the $…B… $ The most appropriate combination for $\mathrm{A}$ and $\mathrm{B}$ is
"Graveyard of $RBCs$''
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