Explosion : I : : Locust : II
    I.   [A] Bomb  [B] Ruin  [C] Debris  [D] Smoke
   II.   [P] Crop  [Q] Holocaust  [R] Pest  [S] Field

 

Answer: C. CQ

Second is the left-over after the first.

Posted in:  Double Analogy -  Analogy -  Verbal Reasoning