This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
A 40 year old man has chronic cough with fever forseveral months. The chest radiograph reveals adiffuse reticulondular pattern. Microscopically ontransbronchial biopsy there are focal areas ofinflammation containing epitheloid cell granuloma,Langhans giant cells, and lymphocytes. Thesefindings are typical for which of the following type ofhypersensitivity immunologic responses: 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
D: Type IV
Answer: D: Type IV 
Explanation: Type IV