MCQ
The cells of immune response are produced in:
- ALiver
- BSpleen
- ✓Bone marrow
- DLymph nodes
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| $A$ | $B$ | $C$ | $D$ | $E$ | $F$ |

Identify $A$ and $B$ and choose the correct option
$(a)$ Numbers $(b)$ Biomass
$(c)$ Pug makers $(d)$ Height