Task: Question Answering
Input (English): Problem: a vessel of capacity 30 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 ? 
Options: a ) 14.7 , b ) 2.9 , c ) 38.3 , d ) 78.3 , e ) 79.3
Output (English): a