Task: Question Answering
Input (English): Question: A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 100 years now, the son's age five years back was:

 Option A: 45 years.

 Option B: 40 years.

 Option C: 30 years.

 Option D: 35 years.

 Option E: 50 years.
Output (English): Option A