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: Pharmacology
Rituximab is used in all EXCEPT : 
Select and explain. 
A. Non Hodgkins lymphoma, B. Paroxysomal nocturnal hemoglobinurea, C. Rheumatoid arthritis, D. Systemic lupus erythematosis
B: Paroxysomal nocturnal hemoglobinurea
Answer: B: Paroxysomal nocturnal hemoglobinurea 
Explanation: None