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
Regarding laryngomalacia -a) Most common cause of stridor in newbronb) Omega- shaped epiglottisc) Inspiratory stridord) Requires immediate surgerye) Stridor worsens on lying in prone position 
Select and explain. 
A. ab, B. bc, C. abc, D. bcd
C: abc
Answer: C: abc 
Explanation: None