Discussion

Match the antibiotics in Group I with the microorganisms that produce them in Group II.

Group I	Group II
(P) Streptomycin	(i) Streptomyces griseus
(Q) Bacitracin	(ii) Bacillus licheniformis
(R) Amphotericin B	(iii) Streptomyces venezuelae
(S) Chloramphenicol	(iv) Streptomyces nodosus

Answer: B

The correct match is (P)-(i), (Q)-(ii), (R)-(iv), (S)-(iii).

Streptomycin, the first aminoglycoside, was isolated by Waksman's group from Streptomyces griseus.
Bacitracin is a peptide antibiotic from Bacillus licheniformis (originally B. subtilis).
Amphotericin B, a polyene antifungal, comes from Streptomyces nodosus.
Chloramphenicol was first isolated from Streptomyces venezuelae.

The option that is otherwise identical swaps amphotericin B and chloramphenicol, and the others misplace streptomycin.

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