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
[{'content': 'Apremilast acts by inhibiting : \nSelect and explain. \nA. IL-17, B. CD25, C. PDE-4, D. IL-23', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Apremilast is a PDE-4\xa0inhibitor used in the treatment of Plaque psoriasis.', 'role': 'assistant'}]