Riddle

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Choose an answer

A.They lied
B.Bill is adopted
C.They are cousins
D.None. He has three sisters.
Hint: It's a 5-word phrase with 21 letters, starting with "N".

Answer

None. He has three sisters.

Why this is the answer

The doctors are female, making them Bill's sisters.

This riddle is filed under Hard/Difficult Riddles and rated Medium.