Nirmal and Dhawal are varieties of: (IGKV CET Horti 2019)

📌 Other Options:
-(b) Sarpagandha: Unrelated medicinal plant valued for reserpine alkaloids.
-Catharanthus roseus: Scientific name for Madagascar periwinkle.

🔴 Related terminology:
-Variety: Cultivated plant differing from wild type.
-Catharanthus roseus: Scientific name for periwinkle.
-Vinblastine and Vincristine: Alkaloids with anti-cancer properties.
-Medicinal Plant: Plant used for therapeutic properties.