All answers are correct!
The tricky thing about common names is that they change with region and culture. Many plant ranges, or territories, far exceed the human "territories" that name them. Therefore, the scientific names of plants (and animals) that include genus and species--and sometimes subspecies--are preferred by scientists, landscapers, nurseries, gardeners, and naturalists to ensure proper, individual identification of each species.
Steven
J. Baskauf
The Creosote Bush (Larrea tridentata) has been studied for its longevity, medicinal uses and phytochemistry, physiology, adaptations, and ecological relationships, just to name a few topics associated with this important plant. It has been found to (be):
the oldest living organism on the planet ("King Creosote" ages in at ~11,700 years old to date)
as useful as penicillin for ancient tribes
currently studied as a potential treatment for certain cancers
home to insects that will only occur with creosote
partake in chemical warfare for survival
The creosote is even responsible for filling the desert air with the uplifting smell of rain as moisture mingles with resins on its waxy, water-saving leaves.
It is not the source of creosote oil!