Which disease is specifically noted as present in the Americas during the Columbian Exchange?

• A. Measles
• B. Syphilis
• C. Smallpox
• D. Yellow fever

Answer: (B)

The main idea here is how diseases moved between continents during the Columbian Exchange and which one is tied most closely to the Americas in that context. Syphilis is the disease most commonly associated with the New World in this exchange because many historians argue it originated in the Americas and then spread to Europe after contact with Columbus and his crews. This makes it a notable example of a disease linked to the Columbian Exchange on the New World side.

In contrast, measles, smallpox, and yellow fever are diseases that were introduced to the Americas from the Old World after contact, leading to devastating outbreaks there. So the disease that is best noted as present in the Americas during the Columbian Exchange, in this context, is syphilis.