<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 26-year-old woman presents to her primary care physician for 5 days of increasing pelvic pain. She says that the pain has been present for the last 2 months; however, it has become increasingly severe recently. She also says that the pain has been accompanied by unusually heavy menstrual periods in the last few months. Physical exam reveals a mass in the right adnexa, and ultrasonography reveals a 9 cm right ovarian mass. If this mass is surgically removed, which of the following structures must be diligently protected?? A: Cardinal ligament of the uterus, B: External iliac artery, C: Internal iliac artery, D: Ovarian ligament, E: Ureter,  <response>: This is a clinical vignette describing a 26-year-old woman with worsening pelvic pain and heavy menstrual bleeding who is found to have a 9 cm right ovarian mass. The question asks which anatomical structure must be diligently protected if this mass is surgically removed. Based on the location of the mass in the right adnexa adjacent to the uterus, the choices provided are relevant pelvic anatomical structures. The ureter runs medial to the ovary and is at high risk of injury during ovarian mass resection, so protecting the ureter is critical.E: Ureter 