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
A female come to gynaeoPD for preconceptual counseling, with history of two second trimester aboions. What is the next investigation you will advice 
Select and explain. 
A. TVS, B. hysteroscopy, C. Endometrial biopsy, D. chromosomal abnormalities
A: TVS
Answer: A: TVS 
Explanation: Ans: A. TVSRef: Williams Obstetrics 24h ed"Most common cause of second trimester aboion is cervicouterine abnormalities.Next step would be to do an ultrasound and look for any structural uterine anomaly.Chromosomal abnormalities are common cause of aboftions in first trimester.