What is the name of the Sonoran Desert cactus that can live over 150 years, weigh several tons, and grows arms only after reaching about 75 years of age?

• A Saguaro ✓
• B Organ pipe cactus
• C Barrel cactus
• D Prickly pear

The saguaro (Carnegiea gigantea) is found almost exclusively in the Sonoran Desert and its white flower is the state flower of Arizona.