18 months old child presents with low grade fever, stridor and barking cough. His chest x-ray was taken and given below. 
The line of treatment is
The given case scenario is a case of Croup. X-ray shows steeple sign. Single dose of Dexamethasone is the treatment of choice.
3rd generation Cephalosporins
Heimlich's Maneuver
Reassurance
Single dose of Dexamethasone