You are answering a USMLE-style medical question. Question: A six-year-old boy with a history of asthma currently uses an albuterol inhaler as needed to manage his asthma symptoms. His mother brings him into your office because she feels she has had to increase the patient’s use of his inhaler to four times per week for the past month. She also reports that he has woken up three times during the night from his symptoms this month. The boy reports that he is upset because he can’t always keep up with his friends in the playground. His past medical history is significant for allergic rhinitis. The patient’s temperature is 98°F (36.6°C), blood pressure is 110/70 mmHg, pulse is 88/min, and respirations are 18/min with an oxygen saturation of 98% O2 on room air. Auscultation of his lungs reveals bilateral late expiratory wheezes. What changes should be made to his current asthma treatment regimen? Options: A) Maintain current therapy B) Add fluticasone daily C) Add salmeterol twice daily D) Add zileuton twice daily Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.