The correct option is D Both b and c
Chloramphenicol (Chloromycetin) is a broad-spectrum antibiotic isolated in 1949 from Streptomyces venezuelae (A bacteria found in soil). It's mainly used to treat eye infections (such as conjunctivitis) and sometimes ear infections. Chloramphenicol comes as eye drops or eye ointment. Chloramphenicol is a chlorine containing antibiotic. It is also used for the treatment of typhoid fever.