Which symbol is incorrectly used as the primary logo for many medical organizations in the US, despite not being the historically accurate symbol of medicine?

The medical profession is represented by iconic symbols that have deep historical roots. One such symbol has become nearly universal in medical branding and product design in the United States, despite some controversy about its historical accuracy. Test your knowledge about medical logo design and its fascinating history in this trivia challenge about one of healthcare's most recognized symbols.

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Caduceus (staff with two snakes and wings)
Rod of Asclepius (staff with single snake, no wings)
Red Cross symbol
Bowl of Hygieia (snake with pharmacy bowl)