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
A lady with CA ovary in follow-up with raised CA125 level nextstep; 
Select and explain. 
A. CT, B. PET, C. MRI, D. Clinical exam and serial follow up of CA 125
B: PET
Answer: B: PET 
Explanation: <p> - positron emission tomography is a functional diagnostic imaging technique, taking note of the fact that malignant cells have a greater glycolysis as ccompared to normal tissue. - it helps in staging , management and follow up of cancer growth. - it is now used in diagnosis of cancer in its early stage, detect its extent and severity. Reference : Shaw&;s textbook of gynaecology,16th edition, pg no: 120 <\p>