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
Most reliable diagnosis of hydatidiform mole is by: 
Select and explain. 
A. HCG estimation, B. Amniography, C. Ultrasound, D. Absence of FHS
C: Ultrasound
Answer: C: Ultrasound 
Explanation: Ultrasound