Task: Question Answering
Input (English): Question: The average age of three persons is 52 years. Their ages are in the proportion of 1:5:7. What is the age in years of the oldest one among them.

 Option A: 9 years

 Option B: 12 years

 Option C: 60 years

 Option D: 70 years

 Option E: 80 years
Output (English): Option D