In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: a cistern 8 m long and 6 m wide contains water up to a breadth of 1 m 85 cm . find the total area of the wet surface .
Options: a ) 102 m sqaure , b ) 100 m sqaure , c ) 152 m sqaure , d ) 164 m sqaure , e ) none of these
Example Output: b

Example Input: Problem: a train is 485 meter long is running at a speed of 45 km / hour . in what time will it pass a bridge of 140 meter length
Options: a ) 20 seconds , b ) 30 seconds , c ) 40 seconds , d ) 50 seconds , e ) none of these
Example Output: d

Example Input: Problem: the radius of a wheel is 22.4 cm . what is the distance covered by the wheel in making 250 resolutions ?
Options: a ) 277 m , b ) 704 m , c ) 352 m , d ) 288 m , e ) 378 m
Example Output:
c