Answer the following question: Fact 1: Electricity sometimes is used for heating buildings. Fact 2: Hospitals incorporate most types of technical systems encountered in other types of buildings. Given the two facts above, what is electricity sometimes used to heat?

Select from the following.
[I] space;
[II] hospitals;
[III] waves;
[IV] direct energy;
[V] energy;
[VI] Light;
[VII] condensation;
[VIII] clouds;
Answer:
[II]