Read the two passages below and answer the question.

Passage A: Yellowstone National Park, located primarily in the U.S. state of Wyoming, is known for its geothermal features such as geysers and hot springs. Old Faithful, a famous geyser in the park, erupts at regular intervals, drawing millions of visitors annually to witness its natural spectacle.

Passage B: Yosemite National Park, situated in California's Sierra Nevada mountains, is renowned for its stunning granite cliffs, waterfalls, and giant sequoia trees. It attracts outdoor enthusiasts for activities like hiking, rock climbing, and photography.

Which national park is primarily known for its geothermal features and famous geyser?