choose odd numeral pair/group -
( 5:50 ), ( 8:128 ), ( 11:242 ), ( 15:370 )

Answer: A. 15:370
In all other pairs, second number is mulitple of  first number.
 
5:50 - 5*10
8:128 - 8 * 41
11:242 - 11 * 22
15:370 - 15 * 24.6