Select the letter-cluster from among the given option that can replace the question mark (?) in the following series. LOT, NRX, KNS, OSY, ?

Logic: LOT: L  MN  O  PQRS  T (Gap between first alphabet ( L ) and the second alphabet ( O ) is of 2 letters, and between the second alpabet ( O)  and the third alphabet ( T)  is of 4 letters) NRX: N   OPQ  R  STUVW  X  (Gap between first alphabet ( N ) and the second alphabet ( R ) is of 3 letters, and between the second alpabet ( R)  and the third alphabet ( X)  is of 5 letters) KNS: K  LM  N  OPQR  S (Gap between first alphabet ( K ) and the second alphabet ( N ) is of 2 letters, and between the second alpabet ( N)  and the third alphabet ( S)  is of 4 letters) OSY: O  PQR  S  TUVWX  Y (Gap between first alphabet ( O ) and the second alphabet ( S ) is of 3 letters, and between the second alpabet ( S)  and the third alphabet ( Y)  is of 5 letters) So the next set is  JMR. JMR :  J  KL  M  NOPQ  R