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a
articulate with the sternum anteriorly
b
articulate with the 7th rib with the help of a hyaline cartilage
c
articulate with 7th rib with the help of a fibrocartilage
d
do not articulate anteriorly
answer is B.
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Detailed Solution
The 8th, 9th and 10th pairs of ribs do not articulate directly with the sternum but join the seventh rib with the help of hyaline cartilage. These are called vertebrochondral (false) ribs.