This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Difference between ectopic pregnancy and threatened aboion is 
Select and explain. 
A. Minimal vaginal bleeding, B. Pain follows bleeding, C. Uterine size corresponds to gestational age, D. Manifests at an early age
C: Uterine size corresponds to gestational age
Answer: C: Uterine size corresponds to gestational age 
Explanation: In Threatened aboion , uterus corresponds to the period of amenorrhea In ectopic pregnancy, uterus is normal or slightly bulky. Ref: Dutta Obs 9e pg171.