<prompt> Which of the following is an example of Type IV hypersensitivity-Ahrus reactionSerum sicknessShwazman reactionGranulomatous reaction  <response>: Granulomatous reaction is a type of type 4. Example of Type IV hypersensitivity: Granuloma formation seen in: Tuberculosis, sarcoidosis, schistosomiasis and other trematode infections and Lepra reaction type I. Skin tests: Tuberculin test Mantoux test PPD test, Lepromin test, Montenegro test leishmaniasis, Frie test LGV. Contact dermatitis Chronic transplant rejection and Graft-versus-host disease. Common expamples of Type III HSN reaction: Ahus reaction Serum sickness Glomerulonephtiritis Rheumatoid ahritis TNFa is primarily responsible for Shwazman reaction, in which repeated injection of LPS obtained from gram negative cell wall into a solid tissue leads to hemorrhagic infarction. 