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
False about Osler's nodes 
Select and explain. 
A. Swellings at fingertips, B. Painless, C. Common in staph aureus endocarditis, D. All the above
B: Painless
Answer: B: Painless 
Explanation: Osler's nodes are painful swellings.