Question

{"given":"The question asks about the number of cervical vertebrae in humans compared to other mammals including whale, rabbit, horse, and giraffe.","key_observation":"All mammals have exactly 7 cervical vertebrae as a fundamental characteristic of mammalian anatomy. This number is constant across virtually all mammalian species, with very rare exceptions like manatees, dugongs, and some sloths. This anatomical consistency is a key feature used in mammalian classification.","option_analysis":[{"label":"(A)","text":"same as in whale","verdict":"correct","explanation":"Correct. Both humans and whales are mammals and therefore both have exactly 7 cervical vertebrae, making the number the same in both species."},{"label":"(B)","text":"more than that in rabbit","verdict":"incorrect","explanation":"Incorrect. Rabbits are also mammals and have 7 cervical vertebrae, the same number as humans, so humans do not have more cervical vertebrae than rabbits."},{"label":"(C)","text":"double than that in horse","verdict":"incorrect","explanation":"Incorrect. Horses have 7 cervical vertebrae like all mammals, so humans have the same number, not double the number of cervical vertebrae as horses."},{"label":"(D)","text":"less than in giraffe","verdict":"incorrect","explanation":"Incorrect. Despite their extremely long necks, giraffes still have only 7 cervical vertebrae like all other mammals, just with much longer individual vertebrae. Humans do not have fewer cervical vertebrae than giraffes."}],"answer":"(A)","formula_steps":[]}