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11^th and 12^th pairs of ribs are connected to the sternum with the help of hyaline cartilage.

Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.

There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

8^th, 9^th and 10^th pairs of ribs articulate directly with the sternum.

answer is C.

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Detailed Solution

There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

11^th and 12^th pairs of ribs are not connected to the sternum.

Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae. Not all are connected ventrally to the sternum.

8^th, 9^th and 10^th pairs of ribs articulate with the 7th rib.

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