This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Pharmacology
Monoclonal antibody used in cancer is 
Select and explain. 
A. Rituximab, B. Cisplatin, C. 5-fluorouracil, D. Methotrexate.
A: Rituximab
Answer: A: Rituximab 
Explanation: Rituximab is a monoclonal antibody against CD20. It is used for treatment of: - Non-Hodgkin lymphoma Chronic lymphoid leukemia Rheumatoid ahritis SLE Auto-immune hemolytic anemia Idiopathic thrombocytopenic purpura OTHER OPTION: Cisplatin is most emetogenic anticancer drug - DOC- esophageal or gastric cancer 5-fluorouracil is a pyrimidine analog and inhibit DNA synthesis by competing with DNA polymerase. Methotrexate is a dihydro folic acid reductase inhibitor. It decreases the formation of DNA.