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: Gynaecology & Obstetrics
"Chemical pregnancy" means : 
Select and explain. 
A. Negative beta HCG and absent gestational sac, B. Positive beta HCG and present gestational sac, C. Positive beta HCG and absent gestational sac, D. Negative beta HCG and created sac margin
C: Positive beta HCG and absent gestational sac
Answer: C: Positive beta HCG and absent gestational sac 
Explanation: Positive beta HCG and absent gestational sac