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
[{'content': 'A lady with CA ovary in follow-up with raised CA125 level nextstep; \nSelect and explain. \nA. CT, B. PET, C. MRI, D. Clinical exam and serial follow up of CA 125', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <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>', 'role': 'assistant'}]