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: Radiology
In second trimester of pregnancy, the diognosis of IUGR can be best made by assessing which of the following parameter – 
Select and explain. 
A. HC, B. AC, C. CRL, D. BPD
D: BPD
Answer: D: BPD 
Explanation: Amongst the given options biparietal diameter is used in 2nd trimester.