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: Unknown
Earliest HCG is detected - 
Select and explain. 
A. 8-10 days after ovulation, B. 8-9 days post fertilization, C. 3-4 weeks, D. 10th day of menstruel cycle
B: 8-9 days post fertilization
Answer: B: 8-9 days post fertilization 
Explanation: Ans-B