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
All are included in the criteria for diagnosis of systemic lupus erythematosus, except: 
Select and explain. 
A. Photosensitivity, B. Malar rash, C. Discoid rash, D. Painful oral ulcers
D: Painful oral ulcers
Answer: D: Painful oral ulcers 
Explanation: SLE produce painless oral ulcers.