Fact 1: When a cooler object touches a warmer object , thermal conduction occurs. Fact 2: Heat sink materials are chosen for their high thermal conductivity. Given the two facts above, what is an example of an object designed to be cool?

Pick your answer from:
(I) a prism.
(II) cold hands.
(III) storing water.
(IV) heat sink.
(V) satellites.
(VI) naturally occurring ice.
(VII) sweating.
(VIII) heater.
The answer is:
(IV)