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 Hodgkin lymphoma, B. Paroxysomal nocturnal hemoglobinurea, C. Rheumatoid ahritis, D. SLE
B: Paroxysomal nocturnal hemoglobinurea
Answer: B: Paroxysomal nocturnal hemoglobinurea 
Explanation: Ans. is 'b' i.e., Paroxysomal nocturnal hemoglobinurea Rituximab o Rituximab is a targeted antibody against cell surface molecule CD-20, i.e. Rituximab is anti CD-20 antibody. o It is used in : 1. B-cell lymphomas --> Low grade lymphomas, mantle cell lymphomas, relapsed aggressive B cell lymphomas, CLL 2. SLE Rheumatoid ahritis