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
Radiological finding in ileal atresia – a) Microcolon on Ba enemab) Double bubble signc) Coil spring appearance in Ba-Enemad) Obstruction in Ba meal 
Select and explain. 
A. b, B. c, C. ad, D. ab
C: ad
Answer: C: ad 
Explanation: Radiological features of ileal - atresia are multiple bubble sign (not double bubble), obstruction on barium meal, microcolon on barium meal, Apple-peel appearance.