Solve Letter Puzzle : E, J, O, T, Z, S, ?

Can you solve this letter puzzle?
Riddle Question

Which letter replaces the question mark?

Can you solve this letter puzzle?
Solve this math problem to see answer.
Riddle Answer

Corrrect Answer : X

Starting with the bottom right hand corner, and moving in a clockwise spiral towards the centre, letters advance through the alphabet, skipping 4 letters at a time.

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