3. Figure 75 is a neck radiograph of a 4-year-old girl who presented with fever and stridor. All of the following statements concerning the patient's diagnosis are true except



Figure 75

A) Parainfluenza virus is the most common organism.
B) It is a medical emergency.
C) The peak incidence occurs in children 3 to 6 years of age.
D) It is less common than croup.
E) Subglottic edema is seen in at least 25 of patients.