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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:
Explanation
12 pairs of ribs; first 7 pairs are true ribs.
Detailed Solution
In humans, 12 pairs of ribs are present, of which 7 pairs ($1^{st}$ to $7^{th}$) are attached dorsally to the vertebral column and ventrally to the sternum (true ribs).