Why is it that some people are unable to digest the lactose contained in dairy products?
A) Lactose can only be digested by people who produce the appropriate amounts of lactic acid.
B) Lactose-intolerant people do not produce lactase, the enzyme needed to digest lactose.
C) Some people do not produce any enzymes, including the one needed to digest lactose.
D) The active site of the lactose enzyme can vary from person to person.
E) Some people have an internal body temperature higher than others, which allows the lactase enzyme to function more efficiently.
B) Lactose-intolerant people do not produce lactase, the enzyme needed to digest lactose.
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