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: Skin
Nikolsky's sign is positive in each of the following conditions, EXCEPT: 
Select and explain. 
A. Pemphigus, B. Toxic epidermal necrolysis, C. staphylococcal scalded skin syndrome, D. Psoriasis
D: Psoriasis
Answer: D: Psoriasis 
Explanation: The Nikolsky phenomenon is positive when the epidermis is dislodged from the dermis by lateral, shearing pressure with a finger, resulting in an erosion. It is an impoant diagnostic sign in acantholytic disorders such as pemphigus or the staphylococcal scalded skin (SSS) syndrome or other blistering or epidermonecrotic disorders, such as toxic epidermal necrolysis. Ref: (2013). Introduction. In Wolff K, Johnson R, Saavedra A.P. (Eds), Fitzpatrick's Color Atlas and Synopsis of Clinical Dermatology, 7e.