A 5 year old boy presented with sudden onset of fever, dysphagia, drooling, muffled voice, inspiratory retractions, cyanosis and soft stridor.
On X ray of neck,the following is seen.
Which is the most common causative organism of this condition?
A > Staphylococcus aureus.
B > H influenza.
C > Streptococcus.
D > Pseudomonas.