"Nicotine is the chief mind-affecting substance in tobacco leaves. The World Health Organization reports that consuming tobacco is the leading cause of preventable death worldwide—over one billion people consume nicotine regularly, causing nearly six million deaths each year. Tobacco is most commonly smoked, but is also sometimes snorted, in snuff form, or absorbed in the mouth, in chew form. In small doses it increases alertness, reduces anxiety, dulls pain, and raises blood pressure. With higher doses, however, it can cause increased anxiety, uncomfortable restlessness, and an inability to focus. In combination with the other chemicals found in tobacco products such as cigarettes and chews, nicotine is highly addictive."
This passage is an example of a
A) Definition
B) Comparison
C) Classification
D) Explanation