Q: You are presented with the quiz "What can be used to reveal what lies hidden in darkness?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "alaser is used for producing light" and "light reveals what lies hidden in darkness". So, what's the best answer to the question?

Available choices: [-] A laser [-] Night [-] photons [-] energy [-] Electrical [-] Blackness [-] heat [-] Hidden health issues
The answer is:
A laser