Dairy products chain — arrange from source to final product Items: 1. Curd 2. Milk 3. Buttermilk 4. Cow 5. Ghee 6. Butter

Introduction / Context:
Hydraulic dairy chain from animal source to clarified fat.

Step-by-Step Solution:
Cow (4) → Milk (2) → Curd (1) → Buttermilk (3) → Butter (6) → Ghee (5).

Why Other Options Are Wrong:
They place ghee or butter before churning/clarifying steps.

Final Answer:
4, 2, 1, 3, 6, 5