Which of the following people is at highest risk for multiple sclerosis?
a. an elderly man with a family history of multiple sclerosis living in Panama
b. a young man living in California who spends a lot of time in the sun as a construction workera young man living in California who spends a lot of time in the sun as a construction worker
c. an older woman with a family history of multiple sclerosis who lives in Mexico
d. a young woman with a history of mononucleosis living in New York
Question 2
Multiple sclerosis results from
a. strong heritability.
b. exposure to environmental toxins.
c. a combination of heritability and environmental factors.
d. excessive exposure to the sun.
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