MMMU-Pro Extended

A 42-year-old man has had fever, night sweats, weight loss of 3 kg, and cough with hemoptysis over the past 3 months. On physical examination his temperature is 37.6°C. His chest radiograph shows reticulonodular infiltrates, primarily in upper lung fields. The representative microscopic appearance of his lung is seen here. He is most likely to be infected with which of the following organisms?

Options: A. Cytomegalovirus B. Mycobacterium kansasii C. Legionella pneumophila D. Pneumocystis jirovecii E. Mycobacterium tuberculosis F. Streptococcus pneumoniae G. Haemophilus influenzae H. Influenza A virus I. Histoplasma capsulatum J. Staphylococcus aureus

Answer the preceding multiple choice question. The last line of your response should be of the following format: 'Answer: $LETTER' (without quotes) where LETTER is one of options. Think step by step before answering.