Task: Question Answering
Input (English): Question: A mixture contains milk and water in the ratio 5:2. On adding 10 liters of water, the ratio of milk to water becomes 5:3. The quantity of milk in the original mixture is?

 Option A: 30

 Option B: 40

 Option C: 50

 Option D: 60

 Option E: 70
Output (English): Option C