Which pharmaceutical company first adopted the famous 'Rod of Asclepius' (staff with a single snake) as part of its corporate logo, helping to establish it as a widely recognized healthcare symbol?

The healthcare and pharmaceutical industries rely heavily on brand recognition for both patient trust and market differentiation. Many medical brands have created iconic logos and symbols that are instantly recognizable to healthcare professionals. This trivia question tests your knowledge of one of the most recognizable symbols in medicine, which has become synonymous with quality healthcare products worldwide.

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Bayer AG (1863)
Merck & Co. (1891)
Johnson & Johnson (1887)
Pfizer Inc. (1849)