Match the pair

	Column I (Type of addiction)		Column II (Organ/system affected)
i	Heroin	a.	increases neurotransmitter dopamine
ii	Marijuana	b.	Cardiovascular system
iii	Cocaine	c.	liver cirrhosis
Iv	Alcohol	d.	gastro intestinal tract

Select the correct option from the following.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.