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: ENT
True about laryngomalacia -a) Most common cause of congenital stridorb) Inspiratory stridor normal on cryingc) Prone position worsens conditiond) 50% of patients requires surgerye) Omega shaped epiglottis 
Select and explain. 
A. a, B. b, C. ab, D. ae
D: ae
Answer: D: ae 
Explanation: None