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:

1. X=12, Y=5 True ribs are attached to vertebral column and sternum on the two ends.
2. X=24, Y=7 True ribs are dorsally attached to vertebral column but are free on ventral side.
3. X=24, Y=12 True ribs are dorsally attached to vertebral column but are free on ventral side.
4. X=12, Y=7 True ribs are attached dorsally to vertebral column and ventrally to the sternum.

Subtopic:  Sternum & Ribs |
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