A 2-year-old child presents with a sudden onset of barking cough, inspiratory stridor, and hoarseness. The child is afebrile and otherwise active. Parents report the symptoms worsened overnight. Physical examination reveals mild intercostal retractions. What is the most likely diagnosis?
✓ Correct Answer: Option D
The classic presentation of a barking cough, inspiratory stridor, and hoarseness in an afebrile child, particularly worsening at night, is characteristic of croup (laryngotracheobronchitis), usually caused by parainfluenza virus.