<s>[INST] A 10-year-old girl is being evaluated for her first episode of wheezing, which started 3 days ago. Physical exam reveals a mild wheeze and mild tachypnea with an oxygen saturation of 98% on room air. In addition to the patient's history and physical examination, what other diagnostic evaluation should be performed on this 10-year-old girl?
A) Chest radiograph
B) Arterial blood gas
C) Methacholine challenge
D) Pulmonary function tests
A. Chest radiograph
B. Arterial blood gas
C. Methacholine challenge
D. Pulmonary function tests[/INST]