Detailed Instructions: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Problem:Problem: 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 52 years now, the son ' s age 5 years back was :
Options: a. a. 14, b. b. 67, c. c. 56, d. d. 21, e. e. 34
Solution:
d