Idiom
Hemoglobin ,the oxygen carrying substance in red blood cells,is a

Carbohydrates
Fats
Proteins
Nuclei acid

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. I raked my brains to solve this difficult problem.

I used my common sense
I brainwashed several experts
I read number of books
I subjected my mind to hard thinking
I consulted several people

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