This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
Contrast material used in the diagnosis of esophageal atresia is - 
Select and explain. 
A. Gastrograffin, B. Conray 420, C. Dianosil, D. Myodii
C: Dianosil
Answer: C: Dianosil 
Explanation: Dianosil is the contrast agent used for Esophageal atresis, tracheo esophageal fistula and bronchoscopy.