Lactose TOLERANCE Is the Exception, Not the Norm

Lactose TOLERANCE is the exception, not the norm. This is because:

A) All adults have the enzyme lactase, which helps us to digest milk.
B) Fishing populations are more likely to be exposed to lactose bacterium and therefore to have evolved a tolerance for it.
C) Where milk is taboo infants never get exposed to it, causing an intolerance later in life.
D) Lactose tolerance only holds a selective advantage for populations with dairy herds.
E) Lactose tolerance only holds a selective advantage for populations living near the equator.