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
Which is the most common site of subcutaneous nodules in rheumatoid arthritis - 
Select and explain. 
A. Elbow, B. Wrist, C. Achilles tendon, D. Occiput
A: Elbow
Answer: A: Elbow 
Explanation: None