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: Medicine
All of the following are true about Raynaud's disease, except: 
Select and explain. 
A. More, common in females, B. Positive Antinuclear Antibodies, C. Most common cause of Raynaud's phenomenon, D. Has good prognosis
B: Positive Antinuclear Antibodies
Answer: B: Positive Antinuclear Antibodies 
Explanation: Raynaud's disease is not associated with anti nuclear antibodies (ANA's). ANA's are seen in sjogren's syndrome, rheumatoid ahritis, autoimmune hepatitis, scleroderma, polymyositis & dermatomyositis. Ref: CMDT 2006 Edition, Page 464-465; Harrison's Principles of Internal Medicine, 16th Edition, Page 1489.