Meaning of 'hot line'

[lauryn]

Test No. incompl/inter-18 "Hot and Cold", question 9

The police have set up a special hot ......... so that people can get in touch to find out about the accident.

(a) connection
(b) line
(c) communication
(d) phone

Test No. incompl/inter-18 "Hot and Cold", answer 9

The police have set up a special hot line so that people can get in touch to find out about the accident.

Correct answer: (b) line

Your answer was: incorrect
The police have set up a special hot connection so that people can get in touch to find out about the accident.
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why is hot line?

[Alan]

Line is used here in the sense of telephone line and hot refers to the fact that it's live now and can be used immediately.
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