Match List–I with List–II :
List-I:
a. Grey Revolution
b. Pink Revolution
c. Silver Revolution
d. Red Revolution
List-II:
1. Onion production
2. Tomato and meat production
3. Production of eggs
4. Fertilizers

Matching agricultural revolutions with their products: Grey Revolution corresponds to Fertilizers (a-4), Pink Revolution to Onion and Prawn pharmaceuticals (b-1), Silver Revolution to Egg and Poultry production (c-3), and Red Revolution to Meat and Tomato production (d-2). The correct matching code is a-4, b-1, c-3, d-2.