Which of the following is an antifertility drug?

The structure given below is known as

Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?

Ranitidine belongs to which of the following class of drugs?

Assertion : Penicillin is an antibiotic.
Reason : The drugs which act on the central nervous system and help in reducing anxiety are called antibiotics.

Why do we require artificial sweetening agents?