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Stem cell preserved in sterile vials are kept in liquid nitrogen at ………….to ……………….. .
A. `-135^@ C " to " -190^@C`
B. `-125^@C " to " -150^@C`
C. `135^@C " to " 190^@C`
D. `133^@C " to " 187^@C`

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Correct Answer - A
`-135^@ C " to " -190^@C`

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