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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 dorsally 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.

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

Solution

True ribs are directly attached to the sternum, while false ribs are not. There are 12 pairs of ribs, with the first 7 pairs being true ribs.

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