Two problems encountered in human health risk assessment are ________ and ________.
A. Lack of planning; the involvement of politics
B. There are no inherent problems in human health risk assessment
C. Use of chemical mixtures; lack of knowledge about synergistic effects
D. Extrapolation of data to low doses; extrapolation of data from nonhuman species to humans
E. Lack of funding for federal mandates; lack of public support
Answer: D
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