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.

[Q]: Problem: there are 7 pairs of socks and 2 socks are worn from that such that the pair of socks worn are not of the same pair. what is the number of pair that can be formed.
Options: a. 40, b. 49, c. 41, d. 56, e. 42
[A]: e


[Q]: Problem: what least number should be added to 1057, so that the sum is completely divisible by 23
Options: a. a. 4, b. b. 1, c. c. 2, d. d. 3, e. e. 5
[A]: b


[Q]: Problem: find the volume & curved surface area of a cylinder with diameter of base 14 cm and height 60 cm.
Options: ['a. 260 cm 2', 'b. 2610 cm 2', 'c. 2600 cm 2', 'd. 2640 cm 2', 'e. 264 cm 2']
[A]:
d