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What major medical doctrine did Marshall challenge?

Ulcers caused by stress
Cancer caused by viruses
Diabetes caused by sugar
Asthma caused by pollution

Answer

Ulcers caused by stress was a major medical doctrine challenged by Marshall. Prior to his work, ulcers were believed to be caused by factors such as spicy foods and excessive stomach acid. Marshall's research demonstrated that the bacteria Helicobacter pylori was the primary cause of ulcers, revolutionizing the understanding and treatment of this condition.