<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 29-year-old woman comes to the physician for evaluation of a mass in the left breast that she first noticed 2 weeks ago. During this period, the mass has not increased in size and the patient has had no pain. Three months ago, she hit her left chest against the closet door, which was painful for a day. Menses occurs at regular 28-day intervals and last for 5 days with moderate flow. Her last menstrual period was 3 weeks ago. Physical examination shows dense breasts and a 2.5-cm well-defined, rubbery, mobile mass that is nontender in the upper outer quadrant of the left breast. There is no axillary adenopathy. Which of the following is the most likely diagnosis?? A: Phyllodes tumor, B: Fibrocystic changes of the breast, C: Fibroadenoma, D: Lobular carcinoma, E: Fat necrosis,  <response>: This is a question about diagnosing a breast mass in a young woman. The key facts are: - 29 year old woman- 2.5 cm well-defined, rubbery, mobile mass in the left breast upper outer quadrant- Mass appeared 2 weeks ago and has not changed in size- No pain or tenderness associated with the mass- History of trauma to the left chest from hitting a closet door 3 months ago - Regular menstrual cyclesThe lack of pain, tenderness, and change in size makes cancer less likely. The history of trauma to the area makes fat necrosis a possibility. However, the mobile, rubbery mass is most consistent with a benign fibroadenoma, which is a common benign tumor in young women.C: Fibroadenoma 