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': 'Which of the following antimalarial has immunomodulatory effect? \nSelect and explain. \nA. Hydroxychloroquine, B. Chloroquine, C. Quinine, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hydroxychloroquine is an antimalarial agent with immunosuppressant propeies. It is thought to suppress intracellular antigen processing and loading of peptides onto MHC class II molecules by increasing the pH of lysosomal and endosomal compaments, thereby decreasing T-cell activation. Ref: Katzung 11th edition, Chapter 61.', 'role': 'assistant'}]