Which of the tissues that can be in the path of the dental x-ray beam is most radioresistant?

lens of the eye
red bone marrow in the mandible
the enamel of the teeth
thyroid gland

the enamel of the teeth

Rationale: the enamel of the teeth – The enamel of the teeth is radioresistant due to its lack of dividing cells. Enamel is a hardened, calcified matrix and does not contain rapidly dividing cells.

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Which of the following foods is a good source of vitamin C?

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