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

Options

A. `{:(X = 12"," Y = 7,"True ribs are attached dorsally to vertebral"),(,"column and ventrally to the sternum"):}`
B. `{:(X = 12","Y = 5,"True ribs are attached dorsally to vertebral"),(,"column and sternum on the two ends"):}`
C. `{:(X = 24","Y = 7,"True ribs are dorsally attached to vertebral column"),(,"but are free on ventral side"):}`
D. `{:(X = 24","Y = 12,"True ribs are dorsally attached to vertebral column"),(,"but are free on ventral side"):}`

Answer

A