Read the following excerpt from an informational text and answer the question below:

“The term "It's not over until the fat lady sings" comes from the opera Der Ring des Nibelungen. The opera has a painfully long sixteen hour run time and ends with a character, commonly played by a large woman, singing a twenty minute solo. While the large operatic woman is commonly portrayed wearing a horned hat, a Brünnhilde is actually a winged hat.”

What sentence should be rewritten due to bias?