This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
This is a barium swallow showing 
Select and explain. 
A. Carcinoma esophagus, B. Achalasia cardia, C. Nut cracker esophagus, D. Oesophageal stricture
A: Carcinoma esophagus
Answer: A: Carcinoma esophagus 
Explanation: This is an image of the distal esophagus from a barium swallow demonstrating an irregular, somewhat nodular filling defect probably due to carcinoma oesophagus