This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eczema and related disorders, Subject name: Dental
Darier's sign is associated with ? 
Select and explain. 
A. Uicaria, B. Smooth muscle hamaoma, C. Uicaria pigmentosa, D. Atopic dermatitis
C: Uicaria pigmentosa
Answer: C: Uicaria pigmentosa 
Explanation: Options Associated with Uicaria Dermographism Smooth ms hamaoma Pseudo Darier sign Uicaria pigmentosa Darier's sign Atopic dermatitis White dermographism Darier's Sign - Mast cell release histamine - Histamine vasodilates vessels producing erythematous lesion.