These days, drug companies and health professionals alike are focusing their attention on cholesterol in the blood. The more cholesterol we have in our blood, the higher the risk that we shall die of a heart attack. The issue is pertinent since heart disease kills more North Americans every year than any other single cause. At least three factors - smoking, drinking and exercise - can each influence levels of cholesterol in the blood.

Which one of the following can be properly concluded from the passage?

Correct answer marked below

If a person has low blood cholesterol, then that person's risk of fatal heart disease is low.

Smoking in moderation can entail as great a risk of fatal heart disease as does heavy smoking

A high-cholesterol diet is the principal cause of death in North America

The only way that smoking increases one's risk of fatal heart disease is by influencing the levels of cholesterol in the blood

The risk of fatal disease can be altered by certain changes in lifestyle

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What this question tests

Whether you can identify the argument's main conclusion as opposed to a supporting premise.

Selecting a restatement of a premise or a side point instead of the central conclusion.