This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
Cause of acute abdomen in pregnancy are all except : 
Select and explain. 
A. Aboion, B. Placenta prae, C. Preterm labour, D. Appendicitis
B: Placenta prae
Answer: B: Placenta prae 
Explanation: Obstetric problems:Aboion,ectopic pregnancy,abruption acute hydramnios,preterm labour,severe preeclampsia. Gynaecological: Torsion of ovarian cyst,Red degeneration of fibroid Surgical: Acute appendicitis,Acute cholecystitis,volvulus. Medical:Acute pyelo nephritis,acute cystitis. TEXT BOOK OF OBSTETRICS,Sheila Balakrishnan,2nd edition,page no.334