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
Contrast material used in the diagnosis of esophageal atresia is: 
Select and explain. 
A. Barium swallow, B. Gastrograffin, C. Conray, D. Dianosil
D: Dianosil
Answer: D: Dianosil 
Explanation: Ans. Dianosil