This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psoriasis, Subject name: Dental
A patient with psoriasis was staed on systemic steroids. After stopping the treatment, the patient developed generalized pustules all over the body.The cause is most likely to be - 
Select and explain. 
A. Bacterial infection, B. Erythrodermic Psoriasis, C. Drug induced reaction, D. Pustular psoriasis
D: Pustular psoriasis
Answer: D: Pustular psoriasis 
Explanation: Patient of psoriasis on withdrawal of systemic steroids leads to: 1)Pustular Psoriasis: - Multiple sterile pustules develop on whole body(including palms & soles) k/a sterile as there is no infection, only infiltration present. -If generalised k/a Von Zumbusch disease. - Other provocating factors include Infection, Pregnancy and Hypocalcaemia associated with hypoparathyroidism. 2) Erythrodermic psoriasis >90% body surface area shows redness/inflamed or/- scaling Systemic steroids are contraindicated in psoriasis as, on withdrawal it causes pustular psoriasis except inpregnancy where they are drug of choice