Q: Fact 1: Electricity sometimes is used for heating buildings. Fact 2: Electrical energy is also energy. Given the two facts above, what is used for heating buildings?

pick from the following. (i) engines; (ii) light; (iii) temperature; (iv) climate; (v) energy; (vi) calcite; (vii) oil; (viii) wind;
The answer is:
(v)