This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
A patient gets reccurent urticaria while doing exercise and on exposure to sunligh. Which of the following is most like cause – 
Select and explain. 
A. Chronic Idiopathic Utricaria, B. Universal dermographism, C. Cholinergic utricaria, D. photodermatitis
C: Cholinergic utricaria
Answer: C: Cholinergic utricaria 
Explanation: This patient develops urticaria after:-


Exercise
Exposure to sunlight → generalized heating


Both of these provoke cholinergic urticaria due to stimulation of cholinergic sympathetic fibres.