Name two antibiotics.

Name any two antibiotics with their microbial source.

What are antibiotics? Name any two antibiotics which are specifics for certain diseases.

Antibiotics are the chemicals obtained from the useful micro-organisms and employed to kill some harmful micro organisms. But all the antibiotics do not have medicinal importance. Answer the following questions related to antibiotics: (i) List the properties of the antibiotics to be used in medicines. (ii) Discovery of penicillin is said to be a serendipity. Why is it called so? (iii) Name the source of streptomycin antibiotic.

An antibiotic is