This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Targeted Anticancer Drugs and Immunosuppressants, Subject name: Pharmacology
Which of the following anti-cancer drug comes under the group of monoclonal antibodies? 
Select and explain. 
A. Di-ethyl-stilbesterol, B. Tamoxifen, C. Rituximab, D. Boezomib
C: Rituximab
Answer: C: Rituximab 
Explanation: Name of monoclonal antibodies end with -mab. DRUG ANTICANCER GROUP Diethylstilbestrol Hormonal Tamoxifen Hormonal Rituximab Monoclonal antibody Boezomib Proteasome inhibitor