Which option is correct about antibiotics?

(i) Antibiotics are chemical substances, which are produced by some microbes and can kill or retard the growth of other disease – causing microbes.

(ii) Penicillin is first antibiotic obtained by Alexander Fleming from mould Penicillium notatum.

(iii) Fleming, Chain and Florey were awarded the Nobel Prize in 1945, for discovery of Penicillin.

(iv) Antibiotics have greatly improved our capacity to treat deadly diseases.

(v) Plague, whooping cough (kali khansi), diphtheria (gal ghotu) and leprosy (kusht rog), are deadly diseases which kill millions of people all over the globe are treated by antibiotics.

(vi) Antibiotics also obtain from bacteria, fungi and some other microbes.