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: Social & Preventive Medicine
[{'content': 'All of the following factors contribute to Resurgence of malaria, except: \nSelect and explain. \nA. Drug Resistance in host, B. Drug Resistance in parasite, C. Drug Resistance in vectors, D. Antigenic variations in parasite', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Drug resistance in the host does not contribute to Resurgence of malaria, whereas Drug resistance in vectors and parasites and antigenic variations in parasites leads to resugence of malaria. Ref: The Anthropology of Infectious Disease : International Health Perspectives By Marcia Claire Inhorn, Peter J. Brown, Pages 119-127; Medical Disorders in Pregnancy : An Update By Hiralal Konar, Pralhad Kushtagi, Page 77.', 'role': 'assistant'}]