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: Radiology
Barium follow through is used for 
Select and explain. 
A. Esophagus, B. Stomach and duodenum, C. Small intestine, D. Colon and rectum
C: Small intestine
Answer: C: Small intestine 
Explanation: Barium swallow - Esophagus
Barium meal - Stomach and duodenum
Barium follow through - Small intestine
Barium enema - Colon and rectum.