The vanishing twin phenomenon refers to _____.
A. more triplets and quadruplets being born than twins because of fertility drugs
B. the disappearance of embryos within 13 weeks of conception
C. the decreasing percentage of dizygotic twins in favor of monozygotic twins
D. the emergence of an additional fetus in a pregnancy that began with only two fetuses
E. the decreasing percentage of twins in favor of singleton fetuses due to in vitro fertilization techniques
Answer: B
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