This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
Barium swallow is used for- 
Select and explain. 
A. Colon, B. Esophagus, C. Duodenum, D. Jejunum
B: Esophagus
Answer: B: Esophagus 
Explanation: Ans. is 'b' i.e., EsophagusBarium investigationUsed to visualizeBarium swallowMainly for esophagusBarium mealEsophagus, stomach, duodenumBarium follow throughSmall intestine (jejunum and ileum)Barium enemaLarge intestine (colon & rectum)