Car or Goat

You have gone to a game show where the objective is to win a car. The host leads you to a room where there are three absolutely identical doors. You are told that behind one of the doors is the car, and behind the other two is a goat each. The host asks you to select a door. You arbitrarily select a door but the host(who knows what lies behind each door) opens another door showing a goat behind it. Now, it is your final choice and he asks you, "Do you want to stick with your previous choice or do you want to select the other door?" What should be your choice?

PS:- Some of you might have already done this puzzle before. If you have, then please wait for others to respond before you post the solution :)