A patient present with dysphagia of 4 weeks duration. Now he is able to swallow liquid food only. Which of the following is the one investigation to be done ?: (A) Barium studies are the best in this case, (B) Upper GI endoscopy is to be done, (C) CT scan is needed, (D) Esophageal manometry
Answer is B. Answer is 'b' i.e. Upper GI endoscopy is to be done