Which major pharmaceutical company underwent a significant logo redesign in 2011, changing from a shield-like emblem to a more modern, colorful 'spark of life' symbol representing innovation in healthcare?

The healthcare industry is filled with recognizable logos that have become synonymous with medical innovation and patient care. These visual identifiers often have fascinating histories and deliberate design elements that communicate the company's mission. Test your knowledge of pharmaceutical and medical device branding with this challenging question about a famous medical logo's transformation over time.

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Pfizer
Merck
Abbott Laboratories
Johnson & Johnson