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". 

Topic: Gay adoption
 Argument: Children do better with mother and father role models.
against

Topic: Trans fat ban
 Argument: Trans fat ban will hurt small restaurants most.
against

Topic: Three Gorges Dam
 Argument: The TGD taps China's underexploited hydroelectric potential.

in favor