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
For early diagnosis of CA stomach, which method is used 
Select and explain. 
A. Endoscopy, B. Staining with endoscopic biopsy, C. Physical examination, D. Ultrasound abdomen
B: Staining with endoscopic biopsy
Answer: B: Staining with endoscopic biopsy 
Explanation: Diagnosis of Carcinoma stomach Endoscopy is the best method to diagnose gastric cancer as if visualizes the gastric mucosa and allows biopsy for a histological diagnosis Chromoendoscopy helps identification of mucosal abnormalities through topical stains Magnification endoscopy is used to magnify standard endoscopic field by 1.5 - 150 times Narrow band imaging affords increased visualization of the mictovasculature Confocal laser endomicroscopy permits in vivo, three dimensional microscopy including subsurface structures EUS is a tool for pre operative staging and selection for Neoadjuvant therapy Ref: Sabiston 20th edition Pgno : 1218-1221