> The doctor is the boy's father. This is a classic riddle that highlights gender bias - many people assume doctors must be men, but don't initially consider that the doctor could be the father.

It identified the pattern, but it didn't understand the father is a man while the mother is a woman. If people assume doctors must be men, they wouldn't consider that the doctor could be the mother.

(Side note: this is an antiquated riddle/joke ... for me in particular because my mother is a doctor, but in general around half of new doctors are female, and think about Grey's Anatomy and other shows.)