What is ibuprofen used for?

Which one of the following compounds is an antifertility drug?

Given below are two statements: One is labelled as Assertion $A$ and the other labelled as Reason $R$.
Assertion $A:$ Antihistamines do not affect the secretion of acid in stomach.
Reason $R :$ Antiallergic and antacid drugs work on different receptors.
In the light of the above statements,choose the correct answer from the options given below:

Identify a bacteriostatic $(A)$ and bacteriocidal $(B)$ antibiotic from the following:

Which of the following is used as an antacid?

Which of the following is not a tranquilizer?