Occupational and Environmental Health: Recognizing and Preventing Disease and Injury - Multiple Choice Questions - Learn & Prevent

Yellowstone National Park was established by Congress in 1872, making it the World's first official national park. The other options given are incorrect because Yellowstone was not established in 1901, 1856, or 1923. These years are also outside of the timeframe for when national parks were first established by Congress in the United States, which was between 1872 and 1916. Therefore, A is the most accurate answer for the year in which Yellowstone National Park was established.