This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'A 60-year-old man with a chronic cough, bloody sputum, and marked weight loss is diagnosed as having tuberculosis. A "serpentine-like" colonial morphology is noted on Lowenstein-Jensen agar. This latter finding is caused by which of the following factors \nSelect and explain. \nA. A large "slimy" capsule, B. Wax D, C. Coagulase, D. Cord factor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Virulence of the organism is correlated with cord factor (trehalose dimycolate).', 'role': 'assistant'}]