What is collagen?

The oxide,which cannot act as a reducing agent,is

$MTP$ is considered safe up to how many weeks of pregnancy?

The vector $c \cdot (b+c) \times (a+b+c)$ is equal to

Assertion : For an isothermal reversible process $Q = -W$,i.e.,work done by the system equals the heat absorbed by the system.
Reason : Enthalpy change $(\Delta H)$ is zero for an isothermal process.

Match List-$I$ with List-$II$ and select the correct option.

List-$I$	List-$II$
$A$. Cardiac Arrest	$(i)$. Insufficient blood supply to the body
$B$. Heart Failure	$(ii)$. Heart muscle is suddenly damaged
$C$. Heart Attack	$(iii)$. Chest pain due to inadequate oxygen
$D$. Angina	$(iv)$. Heart stops beating