You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Ex Input:
Question: How many inches are in 2000 millimeters? (round your answer to the nearest hundredth of of an inch).

Option A: 51.45 inches

Option B: 86.09 inches

Option C: 67.34 inches

Option D: 34.98 inches

Option E: 78.74 inches

Ex Output:
Option E

Ex Input:
Question: A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg?

Option A: Rs.3.2

Option B: Rs.2.9

Option C: Rs.2.5

Option D: Rs.5.2

Option E: Rs.2.1

Ex Output:
Option C

Ex Input:
Question: Suppose you have three identical prisms with congruent equilateral triangles as the end-polygons. Suppose you attach them by the rectangular faces so they are perfectly aligned. There will be some large faces created by two or more co-planar faces of the individual prisms: count each such large face as one. Given that, how many faces does the resultant solid have

Option A: 4

Option B: 9

Option C: 6

Option D: 10

Option E: 12

Ex Output:
Option C