Step 1: Concept
Clonazepam is used to treat panic disorders and seizures.
Step 2: Meaning
Benzodiazepines are a class of psychoactive drugs characterized by the fusion of a benzene ring and a diazepine ring.
Step 3: Analysis
Drugs ending in "-azepam" or "-azolam" (like Diazepam, Clonazepam, Alprazolam) generally belong to this chemical class.
Step 4: Conclusion
Clonazepam is a nitro-substituted derivative of the benzodiazepine class.
Final Answer: (B)