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Please help solve this question.
A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.
A. A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, B. A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle, C. A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients, D. The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that E. The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,
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C says "A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China". What is cultivated is the Madagascar Perwinkle, and not a derivative of it. Hence choice C is wrong.
Crick
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