This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
Antinuclear-antibodies are present in what percentage of cases of SLE? 
Select and explain. 
A. 50%, B. 70%, C. 80%, D. More than 90%
D: More than 90%
Answer: D: More than 90% 
Explanation: Ref Harrison's internal medicine 20e p2517