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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

Humans have 12 pairs of ribs in total, and the first 7 pairs are true ribs because they attach directly to the sternum. The remaining ribs are false ribs, since they do not have direct sternal attachment.

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