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: Pediatrics
A newborn infant was referred with intermittent cyanosis which improved on crying but worsened when quiet. What is the most likely diagnosis? 
Select and explain. 
A. Diaphragmatic hernia, B. Congenital hea disease (Cyanotic), C. Choanal atresia, D. Tracheal agenesis
C: Choanal atresia
Answer: C: Choanal atresia 
Explanation: Ans. is 'c' i.e., Congenital hea disease (Cyanotic)