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: Dental
A development disturbance in the enamel of mandibular first molar crown usually occurs between which of the following ages 
Select and explain. 
A. 8 months prenatal to one year postnatal, B. Birth to 3 years postnatal, C. 3 years postnatal to 5 years postnatal, D. 6 years postnatal to 8 years postnatal
B: Birth to 3 years postnatal
Answer: B: Birth to 3 years postnatal 
Explanation: None