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: Medicine
[{'content': 'Gene therapy methods are: \nSelect and explain. \nA. Electroporation, B. Intranuclear injection, C. Site directed mutagenesis, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Electroporation, B i.e. Intranuclear infection, C i.e. Site directed mutagenesis', 'role': 'assistant'}]