This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta Previa, Subject name: Gynaecology & Obstetrics
35 weeks pregnancy, painless blood discharge, most likely diagnosis is - 
Select and explain. 
A. Placenta previa, B. Abruptio placenta, C. Ectopic pregnancy, D. None
A: Placenta previa
Answer: A: Placenta previa 
Explanation: Ans. is 'a' i.e., Placenta previa "The only symptom ofplacenta previa is vaginal bleeding. The classical features of bleeding in placenta previa are sudden onset, painless, apparently causeless & recurrent"o Abruptio placenta usually presents with abdominal pain or discomfort followed by vaginal bleeding,o Classical triad of ectopic pregnancy consists of abdominal pain, amenorrhea & lastly appearance of vaginal bleeding.