In each of the following questions, two words indicated by I and II have been left out.The correct word to come in place of I is given as one of the four alternatives against I and the correct words to come in place of II are given as one of the four alternatives against II. Read the correct words, there is some relationship between the two words to the left of the sign (: :) and the same relationship exist between the two words to the right of the sign (: :). The correct combination is given as one of the four alternatives (A), (B), (C) and (D). Find the correct combination in each case.
I : Water : : Thermometer : II