You will be given a definition of a task first, then some input of the task.
In this task you are given a short story and a question regarding that story. You must answer the question based on the events of the story. Try to use the same words in the story to answer each question. You should completely answer the question in a short answer. Do not include information that is unnecessary to answer the question.

Bianca had dark brown hair. She wanted to make her hair a lighter color. She bought hair dye from the store. She dyed her hair a blonde color. Bianca's boyfriend complimented her new hair afterwards.
Why did She buy hair dye?
Output:
Bianca bought hair dye to lighten her hair.