This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
A child presents with stridor, barking cough and difficulty in breathing since 2-3 days. He has fever and elevated leukocyte count. All of the following statements about his condition are true, EXCEPT: 
Select and explain. 
A. Subglottis stenosis and hypopharyngeal dilatation may be seen on X-rays, B. Boys are more commonly affected than girls, C. Symptoms are predominantly caused by involvement of the subglottis, D. Antibiotics form the mainstay of treatment
D: Antibiotics form the mainstay of treatment
Answer: D: Antibiotics form the mainstay of treatment 
Explanation: None