This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of the Respiratory Tract, Subject name: Pediatrics
Most common cause of infectious croup is 
Select and explain. 
A. Adenovirus, B. Parainfluenza type I, C. RSV, D. Influenza
B: Parainfluenza type I
Answer: B: Parainfluenza type I 
Explanation: Ans. is 'b' i.e., Parainfluenza type I Infectious croup (Laryngitis & laryngotracheobronchitis)o Nearly always caused by viral infectiono Usually by parainfluenza type I.o Other-RSVParainfluenza 2,3InfluenzaAdenoviruso TreatmentHumidified oxygenIntravenous fluid for adequate hydrationAntibiotic (ampicillin ceftriaxone) if suspecting epiglottitis.