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
Which one of the following is not associated with rheumatoid ahritis 
Select and explain. 
A. Pleural effusion, B. Pulmonary hypeension, C. Cricoarytenoid ahritis, D. None
D: None
Answer: D: None 
Explanation: Ref - Davidsons 23e p1024