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: Surgery
Which of the following method is used for early diagnosis of carcinoma stomach? 
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: Endoscopy with multiple biopsies and brush cytology is the investigation of choice for gastric cancer. Ref: Schwaz 9/e, Page 932; Harrison 17/e, Page 572.