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Fill in the blanks with the right choice of words.

Iodine deficiency is ____ in these remote mountain regions; however, it is no longer ____ in the lowlands where iodized salt is available.

A

recorded - unusual

B

rare - sporadic

C

eradicated - common

D

endemic - prevalent

E

diagnosed - controlled

Answer

The word 'endemic', which means (of a disease or condition) regularly found among particular people or in a certain area, best fits the context of the first blank whereas 'prevalent' which means widespread in a particular area or at a particular time befits the context of the second blank. Thus D is the answer - it befits the context and conveys the required meaning.
Iodine deficiency is endemic in these remote mountain regions; however, it is no longer prevalent in the lowlands where iodized salt is available.
None of the other options befit the context.

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