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': 'Helmet cells are a feature of \nSelect and explain. \nA. G6PD deficiency, B. pyruvate kinase deficiency, C. Pyrimidine 5 - nucleotidase, D. Adenylate kinase deficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bite cells / Blister cells / Helmet cells - G6PD deficency.', 'role': 'assistant'}]