Morphine is

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Butylated hydroxy anisole when added to butter increases its shelf life.
Reason $R$: Butylated hydroxy anisole is more reactive towards oxygen than food.
In the light of the above statements,choose the most appropriate answer from the options given below:

Among the following,which are narcotic analgesics?

Which substance is applied to the wound caused by a rabid dog bite?

Which of the following is an incorrect match?

What is the scientific explanation for the feeling of depression?