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
Apgar scores were 3, and 6 at 1 and 5 minutes. At 10 Apgar scores were 3, and 6 at 1 and 5 minutes. At 10 minutes child shows features of breathlessness,on CXR-mediastinal shift was there, possible causes – 
a) Bilateral choanal atresiab) Pneumothoraxc) Congenital diaphragmatic herniad) Hyaline membrane disease 
Select and explain. 
A. a, B. bc, C. ac, D. ad
B: bc
Answer: B: bc 
Explanation: Congenital diaphragmatic hernia and pneumothorax cause respiratory distress with mediastinal shift to contralateral side.
Bilateral choanal atresia and HMD cause respiratory distress, but no mediastinal shift.