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: Pathology
[{'content': 'Hypoplastic defects in permanent central and lateral incisors are likely to result due to severe illness or other factors during: \nSelect and explain. \nA. First nine months of life, B. First two years of life, C. First month of life, D. Two or three years of life', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]