Detailed Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Problem:(CNN) The proportion of Zika-related birth defects during 2016 was nearly 20 times higher than the number seen during the pre-Zika years, according to a new report from the United States Centers for Disease Control and Prevention. In particular, brain abnormalities or microcephaly, where a baby's head size is smaller than expected, occurred about 33 times as often in pregnancies with Zika infections than in the pre-Zika years. Zika, a virus transmitted primarily by mosquitoes and unprotected sex, has been spreading around the globe with locally transmitted cases in the US were first reported in Florida and Texas during 2016. Currently, there is no vaccine to prevent infection.Brain abnormalities or microcephaly occurred about 33 times as often in pregnancies with Zika infectionsNew report is based on data from surveillance programs in three US states 
 Question:She said pregnant women should not travel to areas where _ virus transmission and they should also avoid sexual contact with partners who have traveled to areas with Zika virus transmission.
Solution:
Zika