Please answer the following question: Read the following article and select the best answer. Article: Lillan Hanson, a college junior, expects to graduate in about two years. Mrs Hanson, a rather unusual student, plans to go on to take more courses after she gets her degree. What makes Mrs Hanson different from most of her classmates? What sets Lillian Hanson apart from the college crowd is her age-73 years. She has been going to college, a few courses at a time, for 27 years. When Mrs Hanson graduated from high school, she went to her local bank and asked for a loan for college tuition and fees. The banker gave her no encouragement. He didn't think that country girl should be borrowing money to go to college. He thought she should be home doing work in the house or around the farm. So Mrs Hanson went home and raised a family of nine children instead of going to college. She still lives with her husband on the farm that has been in the family for five generations. Mrs Hanson never forgot her dream of getting a higher education. When her children were grown, she tried again. She finds the hardest part of going back to school at her age is to be sitting in class for long periods of time, because she is not as agile as she used to be. Mrs Hanson often gets up and walks around between classes to keep her joints from getting stiff. At the beginning of a course in using the computer, the other students all gave Mrs Hanson a warm round of applause when she introduced herself and explained why she was there and what her goals were. Question: This story mainly about_. - a woman too old for school - a persistent and unusual student - the hardship to get college degree - how to realize one's dream
A:
a persistent and unusual student