Four friends, Lisa, Mark, Nina, and Oliver, are ranked based on their scores in a quiz. Lisa scored higher than Mark but lower than Nina. Oliver scored the lowest. What is the correct order of their scores from highest to lowest?
In a family, there are three siblings: X, Y, and Z. X is older than Y but younger than Z. If Z is a doctor and Y is a teacher, what is X's profession if he is neither a doctor nor a teacher?