Step 1: Concept
Gymnema sylvestre (commonly known as Madhunashini) is a medicinal herb widely used in traditional medicine.
Step 2: Meaning
The active constituents, known as gymnemic acids, have "sugar-blocking" properties.
Step 3: Analysis
Gymnema works by reducing the absorption of sugar from the intestine and increasing insulin production in the pancreas, helping to regulate blood glucose levels.
Step 4: Conclusion
Its primary therapeutic use is in the treatment and management of Diabetes Mellitus.
Final Answer: (C)