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
Vitamin D analogue calcitriol is useful in the treatment of: 
Select and explain. 
A. Lichen planus, B. Psoriasis, C. Pemphigus, D. Leprosy
B: Psoriasis
Answer: B: Psoriasis 
Explanation: Vitamin D3 analogues - Naturally occurring, active metabolite of vit.D3 - 1,25-Dihydroxyvitamin D3 (calcitriol) 3 synthetic analogues: -calcipotriol -1,24-Dihydroxyvitamin D3 (Tacalcitol) and -1,25-Dihydroxyvitamin D3 (Maxacalcitol), effective when applied topically in Psoriasis