Which of these mascots was created to promote Pfizer's Viagra medication in the early 2000s?

Pharmaceutical and medical device companies often create memorable mascots to represent their products and connect with healthcare professionals and patients. These mascots can become iconic symbols that help build brand recognition and communicate complex medical information in an approachable way. Test your knowledge of these famous healthcare industry mascots and see if you can identify which character is associated with which medical brand!

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Digger the Dermatophyte (a cartoon fungus character)
Bob the Bladder (an anthropomorphic bladder character)
Cal the Calcium Man (a muscular skeleton figure)
Hearty (a smiling heart with a stethoscope)