The rib-cage has ___________ pairs of ribs.

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A 15
B 11
C 13
D none of the above

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Answer: D. none of the above

The rib cage has 12 pairs of ribs, that is 24 ribs. Since 12 is not given in the options, the answer is 'none of the above'.

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The rib-cage has ___________ pairs of ribs.

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