Toxicological Trivia from November 27, 2009: Ephedra is a shrub and bulb-like plant that grows in desert regions worldwide. The dried green stems of the three Asian species (Ephedra sinica, E. intermedia, E. equisetina) are used for medicinal purposes. Apparently is native of ancient China, where it was used against asthma for at least:
a) 1000 years;
b) 3000 years;
c) 5,000 years.

Correct answer c. Read information in Spanish about Ephedra, in some selected plants.