Step 1: Concept
Antidepressants are categorized into classes like TCAs, SSRIs, and SNRIs.
Step 2: Meaning
Tricyclic antidepressants (TCAs) are named after their chemical structure, which contains three fused rings of atoms.
Step 3: Analysis
Fluoxetine is an SSRI, while Venlafaxine and Duloxetine are SNRIs. Amitriptyline is a classic example of the tricyclic class.
Step 4: Conclusion
Amitriptyline is correctly classified as a tricyclic antidepressant.
Final Answer: (A)