Assertion (A) : CAD is characterised by a decrease in blood supply to heart muscles.
Reason (R) : The deposition of calcium, fat, cholesterol and fibrous tissue in coronary arteries makes the lumen of arteries narrower.

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Both A and R are true and R is the correct explanation of A.

Both A and R are true and R is not the correct explanation of A.

A is true, but R is false.

A is false, but R is true.

answer is A.

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Detailed Solution

The assertion correctly states that coronary artery disease (CAD) involves a reduction in blood supply to the muscles of the heart.

The reason provided supports the assertion by explaining one of the primary mechanisms underlying CAD. The accumulation of substances like calcium, fat, cholesterol, and fibrous tissue in the walls of the coronary arteries leads to the formation of plaques. These plaques can gradually narrow the lumen (interior) of the arteries, a condition known as atherosclerosis. As the arteries become narrower, they restrict blood flow to the heart muscles, resulting in reduced oxygen delivery to the heart tissue.

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