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(See the complete passage discussion here: lsat/viewtopic.php?t=7945)
The correct answer choice is (A)
Passage Exclusivity questions ask about information contained in only one of the two passages.
Since this question refers to fiber and grit in a diet, recall that their role was discussed in the second
paragraph of Passage B. A thorough understanding of passage organization allows for quick access
to the information necessary to attack questions involving a concept reference.
Answer choice (A): This is the correct answer choice. While too little fiber and grit diminish
tooth wear and increase caries frequency, too much fiber and grit can expose a tooth’s pulp cavity
and can also result in caries (lines 47-50). Therefore, fiber and grit can either limit or promote caries
formation, depending on their prevalence in the diet.
Considering the unusual effect of fiber and grit on caries formation, it would have been wise to
highlight or underline lines 47-50 in Passage B, especially since the topic of fiber and grit is unique
to that passage.
Answer choice (B): This is a Shell Game answer. Although increased reliance on agriculture
increases the consumption of carbohydrate-rich foods, there is no evidence that it also increases the
consumption of fiber and grit. As far as we know, there were no changes in the tooth wear between
Early and Late Ban Chiang Groups (lines 61-63).
Answer choice (C): Since the nutritional value of fiber and grit was never addressed in either
passage, this answer choice is incorrect.
Answer choice (D): This is an Opposite answer. Recall that tooth wear removes fissures on tooth
surfaces, whereas the reduction of fiber and grit diminishes tooth wear (lines 45-48). Clearly, as
long as tooth wear is not severe, fiber and grit would not contribute to the formation of fissures in
tooth surfaces; on the contrary—they may help wear down the tooth surfaces enough to remove the
fissures in them.
Answer choice (E): The effect of fiber and grit on the stickiness of carbohydrate-rich foods was
never addressed in either passage. This answer choice is incorrect.