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: Is Wikipedia valuable?
 Argument: Many incomplete stub articles persist on Wikipedia.'.
[EX A]: against

[EX Q]: Topic: Geoengineering
 Argument: Many geoengineering solutions cut atmospheric greenhouse gases.
[EX A]: in favor

[EX Q]: Topic: Instant replay in baseball
 Argument: Not enough important bad calls occur to justify instant replay.
[EX A]:
against