You will be given a topic and an argument. Decide the argument's stance towards that topic. The argument's stance is in favor or against the topic. If the argument supports that topic, answer with "in favor"; otherwise, if the argument opposes the topic, answer with "against".

Let me give you an example: topic: Nuclear energy
argument: Nuclear energy can reduce materials available for weapons-use.
The answer to this example can be: in favor
Here is why: The given argument is in favor of nuclear energy.

OK. solve this:
topic: Manned mission to Mars
argument: Martian dust is a major risk to a manned mission
Answer:
against