What is the cause of true (primary) microcephaly?
a. Viral infection
b. An autosomal recessive gene
c. Fetal trauma
d. Hydrocephalus
ANS: B
True (primary) microcephaly is usually caused by an autosomal recessive genetic or chromosomal defect. Viral infections and fetal trauma can lead to microcephaly but are not the true cause. Hy-drocephalus does not lead to microcephaly.
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