Matching defuzzified output to crisp output options

Hi, This is my first Fuzzy logic program. I am trying to select temperature of washing depending on the color level of the laundry. The problem I am facing is that the values that I get out of the defuzzification is not exact values that are there in the washing machine options. Eg; washing machine has 20 30 40 60 and 90C options but sometimes i get answers from like 75 50. can this be fixed by choosing another defuzzification method or should i write a function to select the closest value to output(like if it is 75 then 60 or if it is 50 then 40)??