Task: Question Answering
Input (English): Question: With respect to the pharmacological activity of artemisinin (sesquiterpene lactone) extracted from Artemisia annua: 
 Options:  <1> It is a powerful hepatoprotective. <2> It is a powerful cholagogue. <3> It is a potent antitumor. <4> It is a selective antimalarial. <5> It is a potent antiviral.
Output (English): 4