$A$ chemical that prevents blood clotting is most useful in the treatment of

Provide the definitions/explanations for the following terms:
$(1)$ Thrombus
$(2)$ Embolus

Assertion: Saline water is not given to patients of hypertension.
Reason: Saline water can cause vomiting and may drop blood pressure suddenly causing cardiac arrest.

Heaviness with severe chest pain which may disappear with rest indicates:

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

List-$I$	List-$II$
$A$. Cardiac arrest	$(I)$. Heart not pumping blood effectively
$B$. Heart failure	$(II)$. Heart muscle is suddenly damaged
$C$. Heart attack	$(III)$. Acute chest pain
$D$. Angina	$(IV)$. Heart stops beating

$CAD$ stands for