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Out of 'X' pairs of ribs in humans only ...

Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation

A

X = 12, Y = 7 : True ribs are attached dorsally to vertebral column ventrally to sternum.

B

X = 12, Y = 5 : True ribs are attached dorsally to vertebral column sternum on two ends

C

X = 24, Y = 7 : True ribs are dorsally attached to vertebral column sternum on two ends.

D

X = 24, Y = 12 : True ribs are doraslly attached to vertebral column but are free on ventral side.

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The correct Answer is:
A
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