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: Pathology
Formation of multiple pinpoint bleeding spots on scratching the skin is characteristic of: 
Select and explain. 
A. Pemphigus vulgaris, B. Lupus erythematosus, C. Psoriasis, D. Herpangina
C: Psoriasis
Answer: C: Psoriasis 
Explanation: None