Why was it your third answer then?
At first i seriously thought you had the gibberish thing and wanted to play along to test you because i figured if i gave a nonsense answer and you said it was right then it was probably true. Then I wasn't sure if each of the the objects presented represented a door and the key guaranteed a way in. When they didn't i tried putting them together and knew that a clef and a key were musical terms and decided that would be the type of door it would open.