This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumor Markers, Subject name: Gynaecology & Obstetrics
[{'content': '51 yr female with abdominal mass & ascites. On H/P ovarian Ca is +ve for.. \nSelect and explain. \nA. Ca 125, B. Ca19-9, C. AFP, D. hCG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Ca 125 "Fertility preservation in early stage ovarian cancer the uterus and the contralateral ovary can be preserved in women with stage la, grade 1& 2 who desire to preserve fertility. The condition of the women should be monitored carefully with routine periodic pelvic examinations and determinations of serum CA 125 levels."', 'role': 'assistant'}]