Read the sentence to find out whether there is any grammatical mistake/error in it. The error, if any, will be in one part of sentence. Mark that part with error as your answer. If the sentence is correct as it is, mark ‘No errors’ as your answer. (Ignore the errors of punctuation if any)
A red and sore tongue/is an indicator from/lack of iron Vitamin-$$B_{12}$$/in the body.
"Is an indication of" is the correct usage.
"indicator from" is wrong construction.
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