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
More than _____ of body surface is involved in Erythrodermic psoriasis 
Select and explain. 
A. 80%, B. 85%, C. 90%, D. 95%
C: 90%
Answer: C: 90% 
Explanation: Erythrodermic psoriasis is characterised by fusion of margins and >90% of body gets involved