<prompt> Chronic urticaria is a -Type 1 hypersensitivity reactionType 2 hypersensitivity reactionType 3 hypersensitivity reactionType 4 hypersensitivity reaction  <response>: Ans. is a i.e., Type 1 hypersensitivity reaction Types of hypersensitivity reactionType of hypersensitivity reactionExamplesMediatorsType 1 immediate typeAtopic dermatitisUrticariaAnaphylaxisInsect bite hypersensitivityAllergic rhinitis and asthmaIgEType 2 cytotoxic, antibody dependentAutoimmune hemolytic anemiaRheumatic heart diseaseThrombocytopeniaErythroblastosis foetalisGoodpastures syndromeGraves diseaseMyasthenia gravisIgG or IgMMACComplementType 3 immune complex diseaseSerum sicknessArthus reactionRheumatoid arthritisPost streptococcal glomerulonephritisMembranous nephropathyLupus nephritisSystemic lupus erythematosusExtrinsic allergic alveolitishypersensitivity pneumonitisGeneralized drug eruptionErythema multiformeErythema nodosumTENIgGComplementNeutrophillsType 4 delayed typeTuberculosisLeprosyContact dermatitisChronic transplant rejectionMultiple sclerosisT-cells 