Uni Medical care on Instagram: "A 68-year-old man, a smoker for 50 years (80 pack-years), sought medical attention for progressive dyspnea and weight loss. He reported worsening with exertion and the need to sleep with two pillows. On examination, he presented with a barrel chest, vesicular murmur, and paradoxical movement of the lower ribs during inspiration (Hoover’s sign). Sat 02: 89% in ambient air. What is the most likely diagnosis? A) Bronchial asthma B) COPD C) Idiopathic pulmonary fibros