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': 'Which of the following acts as defence against E.coli? \nSelect and explain. \nA. Lactoglobulin, B. Lactalbumin, C. Lactoferrin, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lactoferrin binds to iron and makes it unavailable for E.coli and acts a defence mechanism against infections. Ref: Nutrition and Child Development, K.E. Elizabeth, 4th edition pg: 17', 'role': 'assistant'}]