Asthma is thought to be caused by:
a. an autosomal recessive trait.
b. autoimmunity.
c. excessive use of antibiotics as a young child.
d. interactions between genetic and envi-ronmental factors.
ANS: D
Asthma is an interaction between genetic and environmental factors. Asthma is not a recessive trait or an autoimmune response. Asthma is not due to excessive antibiotic use in childhood.
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