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
Ultrasound is done in 1st trimester for all except: March 2009 
Select and explain. 
A. Multiple pregnancy, B. Fetal anomalies, C. To estimate gestational age, D. To know the position of the placenta
D: To know the position of the placenta
Answer: D: To know the position of the placenta 
Explanation: Ans. D: To know the position of the placenta Benefits of first trimester USG: Viability of the fetus Pregnancy dating Multiple pregnancy detection Detection of ectopic pregnancy Detection of H.Mole Detection of fetal anomalies Placental localization can be done with USG in second half of pregnancy.