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: Surgery
Locally invasive gastric cancer. Investigation of choice to know depth of cancer invasion 
Select and explain. 
A. CECT, B. MRI, C. Barium, D. EUS
D: EUS
Answer: D: EUS 
Explanation: EUS is useful to detect the involvement of layers of the stomach, nodal status and to define whether the tumour is early or advanced. All 5 layers are visualised as alternate hypo - hyperechogenic areas Reference SRB edition :5 page : 851