In each of the following questions, there is some relationship between the two terms to the left of : : and the same relationship holds between the two terms of its right. Also, in each question, one term either to the right of : : or to the left of it is missing. This term is given as one of the alternatives given below each question. Find out this term.
NOPQ : MLKJ : : HIJK : ?
A DEFG B EFGH C FEDC D GFED E None of these