You are answering a USMLE-style medical question. Question: A 25-year-old zookeeper presents to the office complaining of a dry cough, fever, and chills for the past month. He states that the symptoms come in episodes at the end of the workday and last a few hours. He also mentions that he is fatigued all the time. His job includes taking care of various types of birds. He is otherwise fine and denies recent travel or trauma. Medical history is unremarkable and he does not take any medications. He does not smoke cigarettes or drinks alcohol. Allergies include peanuts, dust, and pollen. Childhood asthma runs in the family. Chest X-ray reveals diffuse haziness in both lower lung fields. A PPD skin test is negative. What is the most appropriate treatment for this patient? Options: A) Thoracocentesis B) Inhaled beclomethasone C) Avoid exposure to birds D) Isoniazid for 6 months Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.