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.

Example Input: Problem: find the cost of fencing around a circular field of diameter 32 m at the rate of rs. 2 a meter ?
Options: a. 201, b. 132, c. 772, d. 592, e. 261
Example Output: a

Example Input: Problem: if ( x - 10 ) ( y - 5 ) ( z - 2 ) = 1000 then what is the least value of x + y + z ? if x, y, z are all integer no.
Options: a. 7, b. 8, c. 9, d. 10, e. 11
Example Output: a

Example Input: Problem: divide rs. 1700 among a, b and c so that a receives 1 / 3 as much as b and c together and b receives 2 / 3 as a and c together. a ' s share is ?
Options: a. 346, b. 425, c. 375, d. 337, e. 639
Example Output:
b