This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Colonic disease can be diagnosed by all except 
Select and explain. 
A. Viual colonoscopy, B. Ba enema, C. Ba swallow, D. Ba follow through
C: Ba swallow
Answer: C: Ba swallow 
Explanation: .Indications of Barium swallow * Dysphagia due to motility disorder like achalasia cardia, diffuse oesophageal spasm. * Dysphagia due to mechanical causes like carcinoma, benign strictures and neoplasms, external compression. *Pharyngeal pouch and other diveicula. * GORD .ref:SRB&;s manual of surgery,ed 3,pg no 721