Which of the following is termed as a second messenger?

Which of the following hormones regulates gene expression?

Which of the following forms a hormone receptor complex on the cell membrane?

Select the correct match of hormone and its type.

Which of the following are second messengers?
$I.$ Cyclic $AMP$
$II.$ $IP_3$
$III.$ $Ca^{2+}$
The correct option is:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: $FSH$,which interacts with membrane-bound receptors,does not enter the target cell.
Reason $(R)$: Binding of $FSH$ to its receptors generates a second messenger (cyclic $AMP$) for its biochemical and physiological responses.
In the light of the above statements,choose the most appropriate answer from the options given below: