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': 'Nucleotidase deficiency - \nSelect and explain. \nA. Humoral immunity deficiency, B. Acquired immunity deficiency, C. SCIDs, D. Cell mediated immunity deficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]