Logical puzzle

 A LOGICAL PUZZLE FOR THE DUMBER AMONG THE WHALES   

The doorway to hell   

You are trapped in a room with two doors. One of them leads to certain death, while the other to leads to freedom. You don´t know which is which. At each door there´s a robot guarding it. The robots will let you choose a door, but you will have to go through it. Nevertheless, you can put a question to one of the robots. The problem is that one of the robots always says the truth, while the other always lies, and you don´t know which is which. What question will you ask? 

(see answear below)     

Ask one of the robots what would the other one say, if you asked it which door leads to freedom. After that you can go through the other door, and you will be safe.