179. A 64-year-old Gentleman was admitted with chronic cough and breathlessness. He is a diabetic, chronic smoker with history of COLD for 5 years on Bronchodilators. He gives history of anorexia and low-grade fever for a month. There is no edema or angina. On examination, his pulse was 112/min regular with a BP of 120/74 mm of Hg and RR of 40/min. There was no cyanosis/edema. Clubbing - Grade 3 was present. What is the most probable diagnosis? a. COLD exacerbation b. Cor pulmonale c. Carcinoma lung d. Heart failure