choose the odd one out wrt antibiotics obtained from a filamentous prokaryote.
(1) streptomycin
(2) erythromycin
(3) neomycin
(4) penicillin

Dear student,

The odd one is Penicillin . This antibiotic is obtained from filamentous fungi  Penicillium. All the rest of the mentioned antibiotics are derived from bacteria(actinomycete).
Streptomycin-  derived from the actinomycete Streptomyces griseus
Erythromycin- produced by an actinomycete, Streptomyces erythraeus
​Neomycin- produced by an actinomycete, Streptomyces fradiae​

Regards.