The correct option is B Penicillin
Antibiotics are compounds produced by bacteria and fungi which are capable of killing, or inhibiting, competing microbial species.
Streptomyces is a genus of Gram-positive bacteria that grows in various environments, and its shape resembles filamentous fungi. They produce bioactive secondary metabolites, such as antifungals, antivirals, immunosuppressants, and antibiotics such as erythromycin, streptomycin and terramycin.
Penicillium mold produces the antibiotic penicillin.