A) \[AB,R{{h}^{+}}\]
B) \[AB,R{{h}^{-}}\]
C) \[O,R{{h}^{-}}\]
D) \[O,R{{h}^{+}}\]
Correct Answer: C
Solution :
O group is universal donor; \[R{{h}^{+}}\]blood can be given to a \[R{{h}^{-}}\]person only once, so \[O\,\,R{{h}^{-}}\]is safer.
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