नीचे दिए गए चार रंग विकल्पों में से तीन किसी प्रकार समान हैं और एक समूह बनाते हैं। कौन सा विकल्प उस समूह से संबंधित नहीं है (क्योंकि वह एक प्राथमिक रंग है)?

Choose the pair that is different from the other pairs based on a specific logic.

Based on alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which is the one that does not belong to that group? (Note: The odd man out is not based on the number of consonants/vowels or their position in the letter cluster)