<prompt> Which of the following cause allergic contact dermatitis through air?House dust miteNickelPartheniumDetergents  <response>: ANSWER: C PartheniumREF: Roxburghs 17th ed page 105-109, rooks- 7th ed p. 19.1-19.20, fitzpatrick s p. 1181-1203CONTACT DERMATITISType 4 hypersensitivityDiagnosis by patch test read 2 daysMost common air borne contact dermatitis: Parthenium congress grassMost common contact dermatitis in Indian females: Detergent dermatitisMost common contact dermatitis due to metal: Nickel 