What is the harmful chemical present in tobacco?

Correct option is A

· The harmful chemical present in tobacco is Nicotine.
· Nicotine is a highly addictive substance found in tobacco products and is one of the primary reasons for tobacco addiction.
· When tobacco is smoked, nicotine is absorbed into the bloodstream and reaches the brain within seconds.
· It stimulates the adrenal glands to release adrenaline, which in turn increases heart rate, blood pressure, and the production of dopamine in the brain, leading to feelings of pleasure and reduced stress.
Details of others option-
· Cyanide is a rapidly acting, potentially deadly chemical that interferes with the body's ability to use oxygen.
· Insulin is a hormone produced by the pancreas that helps regulate blood sugar levels.
· Caffeine is a stimulant found in coffee, tea, and certain soft drinks.