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
Koebner's phenomenon is characteristic of – 
Select and explain. 
A. Psoriasis, B. Pemphigus vulgaris, C. Pityriasis rosea, D. Lupus vulgaris
A: Psoriasis
Answer: A: Psoriasis 
Explanation: Disorders showing koebner's phenomenon

Lichen planus           Lichen nitidus                         Darrier disease (Keratosis follicularis)
Psoriasis                   Molluscum contigiosum          DLE
Vitiligo                       Warts                                      Pityriasis rubra pilaris

Rare causes are

Erythema multiforme                                          Necrobiosis lipoidica
Hailey-bailey disease                                         Xanthoma
Leukemia & Carcinoma                                      Vasculitis
Lichen sclerosis