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: Forensic Medicine
Gestational sac can be seen using ultrasonography at the earliest by: Gujarat 07 
Select and explain. 
A. 3rd week, B. 4th week, C. 5th week, D. 8th week
C: 5th week
Answer: C: 5th week 
Explanation: Ans. 5th week