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 28 years old female with a history of 8 wks amenorrhoea complains of vaginal bleeding and lower abdominal pain. On USG examination there is gestational sac with absent fetal parts. The diagnosis is: 
Select and explain. 
A. Ectopic pregnancy, B. Incarcerated abortion, C. Threatened abortion, D. Corpus luteum cyst
B: Incarcerated abortion
Answer: B: Incarcerated abortion 
Explanation: Friends, let’s consider each option one by one.
Option ‘a’: i.e. Ectopic pregnancy