General Studies · Analogy

According to a certain logic, 13 is related to 18. Following the same logic, 9 is related to 10. Following the same logic, which of the given options is 19 related to? (Note: Operations should be performed on whole numbers without breaking down the numbers into their constituent digits. For example, 13 - operations on 13 such as adding/subtracting/multiplying etc. can only be performed on 13. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)