This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antenatal Screening, Subject name: Gynaecology & Obstetrics
[{'content': 'All of the following are ultrasonographic fetal growth parameters except: \nSelect and explain. \nA. Head circumference, B. Trans cerebellar diameter, C. Femur length, D. Biparietal diameter', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Trans cerebellar diametera. Ultrasound imaging: Standard morphometric measurements are as under: Fetal crown-rump length (in first trimester); Biparietal diameter; Head circumference.b. Abdominal circumference; Femur length; and Total intrauterine volume.', 'role': 'assistant'}]