Question

30 \bad\ cholesterol that builds up on artery walls and increases the risk of heart disease and stroke. a ldl b hdl

Explanation:

LDL (low - density lipoprotein) is often referred to as "bad" cholesterol. It can deposit cholesterol on artery walls, forming plaques. Over time, these plaques can narrow arteries (atherosclerosis), reducing blood flow. This increases the risk of heart disease (such as heart attacks) and stroke. HDL (high - density lipoprotein) is considered "good" cholesterol as it helps remove cholesterol from the arteries and transport it back to the liver for processing and excretion.

Answer:

A. LDL