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When a blood group of a person is not known, which type of blood can be transfused to him in an emergency ?

$\begin {array} {1 1} (1)\;A & \quad (2)\;B \\ (3)\;O & \quad (4)\;AB \end {array}$

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( 3 ) is the correct answer.
answered Jan 5, 2014 by balaji
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