This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
18-20 weeks Level II scan is done for 
Select and explain. 
A. Diagnosis of fetal anomaly, B. Lung maturity, C. Sex determination, D. AFI
A: Diagnosis of fetal anomaly
Answer: A: Diagnosis of fetal anomaly 
Explanation: Level II - anomaly, targeted or dating scanAt the second trimester scan they check that your baby is developing normally, they assess the gestational age by measuring the crown-rump length and will also look for any major problems. This is a routine ultrasound examination performed at 18 to 20 weeks of gestation.During the examination, the fetus is seen by abdominal ultrasound. The fetus is now large enough for an accurate survey of the fetal anatomy. With multiple pregnancies, they can be firmly diagnosed and dates and growth can also be assessed. Placental position is also determined. Fuher scans may be necessary if abnormalities are suspected(Refer: William's Obstetrics, 23rd edition)