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: Radiology
Most valuable diagnostic test in a case of suspected ectopic pregnancy: 
Select and explain. 
A. Serial (3-hCG levels, B. Transvaginal USG, C. Progesterone measurement, D. Culdocentesis
B: Transvaginal USG
Answer: B: Transvaginal USG 
Explanation: Transvaginal ultrasound Repeat from Nov 09 Q no.161