Task: Question Answering
Input (English): Question: A vessel of capacity 90 litres is fully filled with pure milk. Nine litres of milk is removed from the vessel and replaced with water. Nine litres of the solution thus formed is removed and replaced with water. Find the quantity of pure milk in the final milk solution?

 Option A: 72.8 litres

 Option B: 72.9 litres

 Option C: 74.9 litres

 Option D: 72.4 litres

 Option E: 72.7 litres
Output (English): Option B