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: Microbiology
[{'content': 'False about Haptens is \nSelect and explain. \nA. Haptens are high molecular weight molecules, B. Lack immunogenicity, C. Retain antigenicity, D. Complex haptens contain two or more epitopes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Haptens are low molecular weight molecules.', 'role': 'assistant'}]