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
Hypoplastic defects in permanent central and lateral incisors are likely to result due to severe illness or other factors during: 
Select and explain. 
A. First nine months of life, B. First two years of life, C. First month of life, D. Two or three years of life
A: First nine months of life
Answer: A: First nine months of life 
Explanation: None