instruction:
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.
question:
Problem: in what time will a train 50 m long cross an electric pole, it its speed be 360 km / hr ?
Options: a. 0.25, b. 0.5, c. 1.5, d. 2.5, e. 3.5
answer:
b

question:
Problem: what is the perimeter of a square field whose diagonal is 8 a s 2 ?
Options: a. 64 m, b. 32 m, c. 30 m, d. 16 m, e. 18 m
answer:
b

question:
Problem: the lenght of a room is 5.5 m and width is 4 m. find the cost of paving the floor by slabs at the rate of rs. 950 per sq. metre.
Options: a. s. 20,550, b. s. 15,600, c. s. 20,900, d. s. 17,600, e. s. 17,900
answer:
c