I want to know the answer to the following question:
What organization has Brazil tried to use to curb US cotton subsidies?
All the background I'm provided with is that "While Brazil was fighting the US through the WTO's Dispute Settlement Mechanism against a heavily subsidized cotton industry, a group of four least-developed African countries – Benin, Burkina Faso, Chad, and Mali – also known as "Cotton-4" have been the leading protagonist for the reduction of US cotton subsidies through negotiations.". Is that enough to answer the question?
Answer: yes