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: Medicine
Features of bronchiolitis are  a) Caused by R.S.V.  b) Wheeze present  c) Pulmonary edema common  d) Seen in immunocompromised hosts  e) Common age groups is from 5 to 15 years age 
Select and explain. 
A. ab, B. ac, C. bd, D. de
A: ab
Answer: A: ab 
Explanation: None