This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus, Subject name: Gynaecology & Obstetrics
Regarding lUGR: 
Select and explain. 
A. Abdominal circumference (AC) is the least sensitive parameter for detection of lUGR, B. In asymmetric lUGR head circumference/abdominal circumference (HC/AC) is reduced, C. Serial biparietal diameter (BPD) is the only impoant measurement in lUGR, D. Abdominal circumference is the most accurate measurement
D: Abdominal circumference is the most accurate measurement
Answer: D: Abdominal circumference is the most accurate measurement 
Explanation: Abdominal circumference is the most accurate measurement to predict IUGR. AC below 10th centile is used as a cutoff. AC should increase by at least 10mm in 2 weeks. AC is measured preferably at the level of the junction of the left and right poal veins,umbilical vein and as round as possible. TEXTBOOK OF OBSTETRICS, Sheila Balakrishnan,2nd edition, page no.205