Correct Answer: B
Explanation:
Rib is a curved, slightly twisted, strip of bone forming part of skeleton of the thorax, which protects the heart and lungs. There are 12 pairs of ribs. The first seven pairs – the true ribs, the next three (8, 9 and 10th) are false ribs and the last two pairs (11th and 12th) are floating ribs. Tt and Tp are called floating ribs as they are not attached with the sternum