instruction:
Classify the given a piece of financial news into three classes: positive, negative, and neutral. Output must be 'positive', 'negative', or 'neutral'.
question:
One of the challenges in the oil production in the North Sea is scale formation that can plug pipelines and halt production .
answer:
negative

question:
Vaisala 's net profit for the third quarter of 2007 dropped to 3.0 mln euro ( $ 4.3 mln ) from 6.8 mln euro ( $ 9.8 mln ) for the same period of 2006 .
answer:
negative

question:
The purchase of sites worth 300 million in the Thames Gateway will provide more than 1,200 homes .
answer:
neutral