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: Pathology
[{'content': 'Cathelicidins are rich in which of the following amino acid? \nSelect and explain. \nA. Cysteine, B. Cystine, C. Methionine, D. Arginine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Microbial killing can also occur through the action of other substances in leukocyte granules. Cationic arginine-rich granule peptides that are toxic to microbes; cathelicidins is present in leukocyte granules. Ref: Robbins 8th edition, Chapter 2.', 'role': 'assistant'}]