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
The sensitive period for tetracycline induced discolouration in the permanent maxillary mandibular incisors and canines is 
Select and explain. 
A. 3 months postpartum to 7th year of Life, B. 4 months in utero to 3 months postpartum, C. 5 months in utero to 9 months postpartum, D. Birth to 7th year
A: 3 months postpartum to 7th year of Life
Answer: A: 3 months postpartum to 7th year of Life 
Explanation: None