This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
In high risk population , HCC is best detected by 
Select and explain. 
A. USG, B. CT, C. MRI, D. PET scan
A: USG
Answer: A: USG 
Explanation: Diagnosis Focal lesion 1-2 cm: Two imaging techniques with aerial hypervascularization and venous wash out Focal lesion> 2cm: One imaging technique with aerial hypervascularization and venous washout Techniques to be considered : Dynamic CT and MRI Screening is based on regular ultrasound scanning in high risk population Biopsy proof of HCC is not required Ref: Sabiston 20th edition 1458-1463