In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.
In the following square represents Doctors, triangle represents Artists, circle represents Weight-lifters and rectangle represents Russians. Which set of letters represents Russians who are not Doctors?