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: Skin
A 30 years old male presented with silvery scales on elbow and knee, that bleed on removal. The probable diagnosis is: 
Select and explain. 
A. Pityriasis, B. Seborrhoeic dermatitis, C. Psoriasis, D. Secondary syphilis
C: Psoriasis
Answer: C: Psoriasis 
Explanation: C i.e. Psoriasis