An ethical dilemma in genetic counseling arises from the gap between what we know how to diagnose and what we know how to treat. Wexler (1992) call this dilemma has been referred to as the Tiresias Complex.In Sophocles' drama Oedipus the King, the city of Thebes is ravaged by plague. Oedipus, King of Thebes, consults Tiresias, blind but possessed of the gift of prophecy. Tiresias, who knows the cause is Oedipus' murder of his own father and incestuous marriage to his own mother, is reluctant to reveal his knowledge: 'It is but sorrow to be wise when wisdom profits not.' Oedipus demands an answer: "Your silence accuses you." Tiresias replies "Miserable man, I speak, because you accuse me, I speak.... The King is the King's murderer."