This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ectopic Pregnancy (Hello ! Where are you ?), Subject name: Gynaecology & Obstetrics
Gestational sac can be seen earliest on transvaginal scan at 
Select and explain. 
A. 4- 5 wks, B. 5 - 6 wks, C. 7 - 8 wks, D. 10 wks
A: 4- 5 wks
Answer: A: 4- 5 wks 
Explanation: Gestational sac Cardiac activity Transvaginal sonography 4 + weeks 5 + weeks Transabdominal sonography 5 +weeks 6 + weeks Please note: in exams the same information may be asked as 'Which week gestational sac is seen" ? the answer choice maybe given as 5th week. so please realize that '4 wks + some days' is actually the 5th week.