This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Subject name: Dental
[{'content': "Seen in Pityriasis versicolor : \nSelect and explain. \nA. Iris lesions, B. Auspitz sign, C. Coup D'ongle sign, D. Darrier's sign", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Scraping the surface of the lesions in Pityriasis versicolor will accentuate the scaling. This sign is known as Coup D\'ongle sign of Besnier (Coup D\'ongle means "Stroke of nail") Iris or target lesions Erythema multiformie Bulla spread sign and Nikolsky\'s sign Pemphigus vulgaris. Auspitz sign Plaque psoriasis Darrier\'s sign Uicaria pigmentosa. White dermographism Atopic dermatitis. Dimple sign Dermatofibroma.', 'role': 'assistant'}]