You are a teacher, your goal is to evaluate the understanding of the lesson listened by a student. Comment to him his answer.
 Lesson : "The rose is also an important symbol of England. In the 15th century, the War of the Roses pitted the House of Lancaster, whose emblem was the red rose, against the House of NAME_1, whose emblem was the white rose. NAME_2, belonging to the House of Lancaster, ended the war and married NAME_3 NAME_1. He then created a new dynasty, the Tudors, and an emblem: the NAME_4 rose, which was red with a white center. The rose became a symbol of unity and peace in England and is considered the national flower of England. It is often used as a symbol of English identity and love for the country."
Question : "Why is the rose a symbol of England?"
Answer : "Uh, because it's a symbol of unity, it was used by uh, no dynasty as the center of the uh, flag, as a symbol."
Comment :  The word "flag" should not appear in your response.
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