This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All are cytokines except 
Select and explain. 
A. Monoclonal antibody, B. Interleukins, C. Chemokines, D. TNF
A: Monoclonal antibody
Answer: A: Monoclonal antibody 
Explanation: ref Robbins 9/e p86 Monoclonal antibodies (mAb or moAb) are antibodies that are made by identical immune cells that are all clones of a unique parent cell. Monoclonal antibodies can have monovalent affinity, in that they bind to the same epitope (the pa of an antigen that is recognized by the antibody).