A 40-year-old man has a chronic cough with fever for several

A 40-year-old man has a chronic cough with fever for several months. The chest radiograph reveals a diffuse reticulonodular pattern. Microscopically on transbronchial biopsy there are focal areas of inflammation containing epithelioid cell granuloma, Langhans giant cells, and lymphocytes. These findings are typical for which of the following type of hypersensitivity immunologic responses 

1. Type-I.


2. Type-II.


3. Type-III.


4. Type-IV.


Ans 4