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: Physiology
[{'content': 'True about cytokines are all except: \nSelect and explain. \nA. It is polypeptide, B. Have autocrine and paracrine effects, C. Involve in leukocytic movements, D. It takes pa in intrinsic enzymatic reaction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e It takes pa in intrinsic enzymatic reaction They are polypeptideQ in nature.Induced their effect in three ways: Autocrine, paracrine & endocrine effects.Q Mediates natural immunity Affects leucocytic movementQRegulate lymphocytic growth activation & differentiation.Activate inflammatory cells & stimulate hematopoesis.', 'role': 'assistant'}]