I have made the basic version, where 10 questions are wired to 10 answers on a board, and a bulb/LED lights if a connection is made (right answer), or nothing happens for a wrong answer. The questions and correct answers are connected by strips of insulated aluminium foil. I want to wire this so that a green LED indicates a right answer, and a red LED a wrong one. I need to keep the circuit fairly simple. Would a CMOS chip do this job, or a simple transistor switch? Thanks for any ideas.