This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
Simplest investigation to be performed for suspected cancer stomach: 
Select and explain. 
A. Double contrast radiography, B. Plain X ray, C. CT scan, D. Endoscopy
A: Double contrast radiography
Answer: A: Double contrast radiography 
Explanation: Ans. (a) Double contrast radiographyRef: Harrison 18th Edition, Page 766* Simplest first investigation: Double contrast radiography* If ulcer is found: Endoscopy must be done to take biopsy