Step 1: Understanding antidepressant drugs. Antidepressants are medications used to treat depression and related mood disorders by altering neurotransmitter levels in the brain.
Step 2: Identifying the correct option.
- Luminol: A chemiluminescent substance used in forensic science, not an antidepressant.
- Tofranil (Imipramine): A tricyclic antidepressant (TCA) commonly used to treat depression.
- Mescaline: A hallucinogenic compound, not used as an antidepressant.
- Sulphadiazine: A sulfonamide antibiotic, not related to depression treatment.
Since Tofranil (Imipramine) is a well-known antidepressant, the correct answer is (B).