This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
Cut-off value for CA-125 is : 
Select and explain. 
A. 15 units/ml, B. 25 units/ml, C. 35 units/ml, D. 45 units/ml
C: 35 units/ml
Answer: C: 35 units/ml 
Explanation: CA-125 tumour marker is raised above 35 IU/mL Refernce: Shaw's Textbook of Gynaecology 16th edition page no 510