A 55-year-old man comes to the office due to malaise and cough over the past 2 months. He describes yellow sputum production with occasional streaks of blood. The patient smokes a pack of cigarettes daily and has a history of alcohol use disorder with prior episodes of binge drinking. Temperature is 37.1 C (98.8 F) . Examination shows poor dentition with dental caries, gingivitis, and enlarged submandibular lymph nodes. Coarse rhonchi are heard during auscultation of the right lung. Chest CT scan reveals an extensive right lung consolidative process with air bronchograms. Bronchoscopy is performed, and a lung biopsy specimen shows the findings in the image below. 
Which of the following is the most likely diagnosis?
Definitions:
Generalized Anxiety Disorder
A chronic condition marked by excessive, uncontrollable worry about everyday matters.
Dissociative Identity Disorder
A psychological condition characterized by the presence of two or more distinct personality states that control behavior in different contexts.
Obsessive-compulsive Disorder
A mental disorder characterized by unwanted and intrusive thoughts (obsessions) and repetitive behaviors or mental acts (compulsions) that an individual feels driven to perform.
Post-traumatic Stress Disorder
A disorder related to mental health, sparked by involvement in or witnessing of an event causing extreme fear, defined by involuntary recollection, terrifying nightmares, and deep anxiety.
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