Concept:Rearrange the jumbled letters to form meaningful words, then find the word that does not belong to the common category.
Explanation:PEREU rearranges to RUPEE, which is a currency.
ROUE rearranges to EURO, which is a currency.
LADROL rearranges to DOLLAR, which is a currency.
OCNEU rearranges to OUNCE, which is a unit of weight, not a currency.
RUPEE, EURO, and DOLLAR are all currencies.
OUNCE is different because it is used to measure weight.
Answer:The odd one out is OCNEU.