The Sensitive period for tetracycline induced discolouration in the permanent maxillary mandibular incisors and canines is________________?

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The Sensitive period for tetracycline induced discolouration in the permanent maxillary mandibular incisors and canines is________________?

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