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
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