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
In early pregnancy, the doubling time of the concentration of human chorionic gonadotropin in plasma in- 
Select and explain. 
A. 1 day, B. 2 days, C. 3 days, D. 5 Days
B: 2 days
Answer: B: 2 days 
Explanation: Ans-B