Mycobacterium tuberculosis (Tuberculosis) Quiz: Ace Your Exams

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A 33-year-old female with a history of Crohn disease is admitted to the hospital with worsening cough, fevers, and night sweats. She is a medical student and recently returned from a mission trip to Honduras. She is otherwise healthy, does not smoke or use illicit drugs, and takes infliximab for management of the inflammatory bowel disease. She subsequently undergoes a lung biopsy, which demonstrates the following microscopic finding:  

 A microscopy image shows a tissue sample with diffuse pink and purple staining. The left side has many small, dark nuclei. The right side has a smoother, lighter pink area.
Image reproduced from Wikimedia Commons  
Which of the following cell types is responsible for the development of the observed microscopic lesion?  

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