This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Skin
The drug NOT used in psoriasis is 
Select and explain. 
A. Psoralens, B. Chloroquine, C. Methotrexate, D. Coaltar
B: Chloroquine
Answer: B: Chloroquine 
Explanation: (B) Chloroquine # TREATMENT OF PSORIASIS: Locally by Topical coaltar.> Wide spread Psoriasis: by Ultraviolet fi-spectrum alone or along with coaltar (Geockerman regimen) or Anthranil (Ingram regimen)> Methotrexate Therapy: Methotrexate is drug of choice in Very Severe form of Psoriatic arthritis & Methotrexate is indicated in Psoriatic erythroderma, Generalized pustular psoriasis, Intractable & Crippling psoriasis.> Psoralens & Ultraviolet-A phototherapy (PUVA): is successful in clearing & delaying recurrence of Chronic Psoriasis.> Etritinate, & its metabolite Acitretin, are Retinoids (Vitamin A derivatives): useful for Severe Resistant Psoriasis.> Systemic drugs useful in Psoriasis: Hydroxyurea, Razoxane & Azathioprine; Cyclosporin A and Topical Vitamin-D3