This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Gynaecology & Obstetrics
In a patient with ectopic tubal pregnancy which is the earliest to rupture? 
Select and explain. 
A. Interstitial, B. Isthmus, C. Ampulla, D. Infundibulum
B: Isthmus
Answer: B: Isthmus 
Explanation: Fate of Ectopic pregnancy - 1. Tubal aboion M/C site is ampulla 2nd M/C site is infundibulum 2. Rupture of the tube M/C site is Isthmus (4-6 weeks) Longest survival - interstitium (12 weeks)