I : Charcoal : : Coal : II
    I.   [A] Fuel  [B] Fire  [C] Wood  [D] Blank
   II.   [P] Ash  [Q] Coke  [R] Smoke  [S] Fire

 

Answer: D. CQ

Second is obtained from the first.

Posted in:  Double Analogy -  Analogy -  Verbal Reasoning