Can u guess which one?!

Can u guess which one?

There are three houses built exactly the same. One is filled with cotton, the other with wood, and the third with iron. One day an arsonist sets them all on fire. The sound of sirens was growing louder at the scene. People were screaming. Which house did the ambulance try to put the fire out at first?

2 weeks ago
to the first answerer: you light the match first..

Ambulances don't put out fires.

You walk into a house with a book of matches. There is a wood stove, a lantern, and fireplace. What do you light first?