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': 'Vectors may transmit infection by all of the following methods, EXCEPT: \nSelect and explain. \nA. Ingestion, B. Regurgitation, C. Rubbing of infected faeces, D. Contamination with body fluids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methods by which vectors transmit an infectious agents are: Biting Regurgitation Scratching in infected faeces Contamination of host by body fluids of vectors Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 92.', 'role': 'assistant'}]