This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Host related biological propeies of a disease agent are the following except \nSelect and explain. \nA. Virulence, B. Infectivity, C. Pathogenicity, D. Communicablity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Host related biological propeies of disease agent are Infectivity Pathogenicity Virulence Ref : parks textbook of PSM 24th edition page no : 41', 'role': 'assistant'}]