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.

Input: Consider Input: Problem: kim has 3 pairs of shoes; each pair is a different color. if kim randomly selects 2 shoes without replacement from the 6 shoes, what is the probability that she will select 2 shoes of the same color ?
Options: a. 2 / 5, b. 1 / 5, c. 1 / 9, d. 1 / 10, e. 1 / 25

Output: b


Input: Consider Input: Problem: what is the units digit of 32 ! + 50 ! + 4 ! + 4 ! ?
Options: a. 0, b. 2, c. 4, d. 6, e. 8

Output: e


Input: Consider Input: Problem: how long does a train 110 m long running at the speed of 72 km / hr takes to cross a bridge 112 m length ?
Options: a. 82.1 sec, b. 12.1 sec, c. 16.1 sec, d. 11.1 sec, e. 12.15 sec


Output: d