This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Guidelines for corect Nuchal translucency measurement are all except 
Select and explain. 
A. Fetus must be in midsagittal plane, B. Fetal neck must be in a neutral position, C. The calipers must be placed parallel to long axis of fetus, D. Amnion must be seen as separate from NT line
C: The calipers must be placed parallel to long axis of fetus
Answer: C: The calipers must be placed parallel to long axis of fetus 
Explanation: The calipers must be placed perpendicular to long axis of fetus.