Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

[EX Q]: Topic: Cellulosic ethanol
 Argument: Cellulosic ethanol packs three-times the energy as corn ethanol.
[EX A]: in favor

[EX Q]: Topic: Legality of coca production and consumption
 Argument: Coca consumption is most akin to caffeine use.
[EX A]: in favor

[EX Q]: Topic: Carbon emissions trading
 Argument: Emissions trading encourages investments in best technologies.
[EX A]:
in favor