This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
Contact dermatitis is an example of--HS 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
D: Type IV
Answer: D: Type IV 
Explanation: Ans: d (Type IV) Ref: Robbins, 7th ed, p. 217Contact dermatitis is an example of tissue injury resulting from delayed hypersensitivityExample-Type I HSTheobald Smith phenomenonPK reactionCasoni'stestAtopic dermatitisExample- Type III HSShick testPost streptococcal GNSLEPANExample- Type II HSBlood transfusionHaemolytic anaemiaAgranulocytosisITPGood pasture's syndromeExample- Type IV HSTuberculin testLepromin testContact dermatitisJones mote reactionRheumatoid arthritis Hashimotos thyroiditisPernicious anaemia# Atopic dermatitis is Type I HS; contact dermatitis is Type IV HS# Type I lepra reaction is Type IV HS; ENL is Type III HS# Type I DM is Type IV HS; Type II DM is Type II HS# Hyperacute rejection is Type III HS; acute rejection Type II HS; chronic rejection Type IV HS