A patient gets reccurent uicaria while doing exercise and on exposure to sunligh. Which of the following is most like cause:

C i.e. Cholinergic Uicaria - Patients developing uicaria (itchy wheals surrounded by erythema) under the influence of any stimulus which includes sweating by increasing core body temperature like physical exeion, emotional upset, and exposure to sun, heat, hot bath or spicy foodQ ours the diagnosis of cholinergic uicaria. Antihistaminics of H1 receptor blockerQ are drug of choice for treatment of uicaria.