Tincture of iodine is an antiseptic for fresh wounds. It is a dilute solution of elemental iodine, which does not contain

An antibiotic is not useful against a virus whereas a vaccine is. Which one of the following is the most appropriate reason for this ?

Which one of the following statements is correct about effects of antibiotics on viruses ?

Which one of the following is an antibiotic drug?

Which metal compound is used for treatment of carcinoma?

The drug obtained from the bark of cinchona was used for treating malaria. The synthetic drug which replaced the natural product is :