Passage: "In the 19th century, many physicians dismissed handwashing as unnecessary. It took decades of evidence and advocacy from pioneers like Ignaz Semmelweis to change medical practice." What does this passage imply about scientific progress?
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A
Scientific progress can be slow and resistant to change even when evidence exists
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B
Handwashing was invented in the 19th century
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C
All doctors in the 19th century ignored hygiene entirely
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D
Ignaz Semmelweis created modern medicine single-handedly