What is the source of the allusion in the sentence below?
Bobby persisted despite his friends' attempts to tell him that this was a Gordian knot.
A: U.S. history
B: ancient legend
The source of the allusion Gordian knot is ancient legend.
According to legend, Alexander the Great used his sword to slash an intricate knot by which a chariot was tied to a pole in the city of Gordium.
The allusion Gordian knot means a highly complex problem.