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
Most common type of psoriasis – 
Select and explain. 
A. Plaque psoriasis, B. Psoriasis vulgaris, C. Both 1 and 2, D. Penile psoriasis
C: Both 1 and 2
Answer: C: Both 1 and 2 
Explanation: Plaque psoriasis, also known as psoriasis vulgaris is the most common type and usual form of psoriasis.