<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 34-year-old man presents to his primary care provider for evaluation of nocturnal cough and dyspnea. He has been a smoker for the past 15 years with a 7.5-pack-year smoking history. He has no significant medical history and takes no medications. His blood pressure is 11876 mm Hg, the heart rate is 84min, the respiratory rate is 15min, and the temperature is 37.0C 98.6F. A sputum sample shows Charcot-Leyden crystals and Curschmann spirals. What is the most likely diagnosis?? A: Chronic obstructive pulmonary disease, B: Atopic asthma, C: Panacinar emphysema, D: Pneumonia, E: Bronchiectasis,  <response>: This is a clinical vignette describing a 34-year-old male smoker presenting with cough and shortness of breath. Key findings include a 7.5 pack-year smoking history, nocturnal cough, dyspnea, normal vital signs, and sputum analysis showing Charcot-Leyden crystals and Curschmann spirals. The sputum analysis provides a key clue, as Charcot-Leyden crystals and Curschmann spirals are characteristic of asthma. The nocturnal symptoms also point towards asthma. While COPD is possible given the smoking history, atopic asthma would be more likely in a relatively young patient with a limited smoking history and no other medical problems. The vital signs do not indicate an infectious process like pneumonia. Bronchiectasis is unlikely given the lack of chronic productive cough.B: Atopic asthma 