The number of floating ribs in human body is

Options

A. 6 pairs
B. 3 pairs
C. 5 pairs
D. 2 pairs

Answer

D

Explanation

One of the last two pairs of ribs are floating ribs. A rib is said to be floating if it does not attach to the sternum or to another rib. There are usually 12 pairs of rib in all. Each pair of ribs is attached to the building block of the spine in the back.