Mario had to save the Princess
Mario in his final quest of saving princess finally came across two doors, labeled A and B. The instruction says that one door consists princess while other contains the fierce dragon. So Mario now had to choose the right gate to save the princess.
Later he notices some board on the door.
Door A says - Dragon is inside!
While Door B says - One of the board is true
Now select the correct option regarding the safety of the doors.