MCQ
In Streptococcus pneumoniae:
- AVirulent form is smooth.
- BVirulent form is rough.
- CNon virulent form is capsulated.
- DAll forms are rough.
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Statement $I$ : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
Statement $II$ : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.
In the light of above statements, choose the most appropriate answer from the options given below :