A white opacity near the incisal one-third of a permanent incisor is MOST likely the result of what?

A white opacity near the incisal one-third of a permanent incisor is MOST likely the result of what?
A . Ingestion of excessive fluoride by the patient’s mother during pregnancy
B . Ingestion of excessive fluoride by the patient at the age of 1 – 3 years
C . Antibiotic therapy by mother during pregnancy
D . Trauma or infection of the patient’s deciduous incisor

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Answer: D