<s>[INST] The next text is a question of a member of the European parliament:"Despite the fact that the Polish authorities have given official undertakings on several occasions, partly at the behest of the European Union, to remove a series of obstacles that make it difficult for EU producers to export ceramic tiles to Poland, there are still serious problems in this area.  In particular, the law that has required, since last year, obligatory certification for ceramic tiles is still in force, in flagrant breach of the rules of international trade and the agreements reached between Poland and the European Union.  What measures has the Commission taken or does it intend to take to ensure that the relevant Polish authorities stop demanding certification of this kind?"
Analyze carefully the text and assign it to the most relevant policy area among those listed below. Do not explain your answer and return only a number.
Policy area numbers: 1 = Macroeconomics
2 = Civil Rights, Minority Issues and Civil Liberties
3 = Health
4 = Agriculture and Fisheries
5 = Labour, employment and pensions
6 = Education
7 = Environment
8 = Energy
9 = Immigration
10 = Transportation
12 = Law and Crime
13 = Social welfare
14 = Regional and Urban issues and Planning
15 = Banking, finance and domestic commerce issues
16 = Defence
17 = Space, science, technology, and communications issues
18 = Foreign trade
19 = International affairs and foreign aid
20 = Governance and government
21 = Public Lands, Water Management and Territorial Issues
23 = Culture and media
[/INST]. Answer = [15]. </s>
Despite the fact that the Polish authorities have given official undertakings on several occasions, partly at the behest of the European Union, to remove a series of obstacles that make it difficult for EU producers to export ceramic tiles to Poland, there are still serious problems in this area.  In particular, the law that has required, since last year, obligatory certification for ceramic tiles is still in force, in flagrant breach of the rules of international trade and the agreements reached between Poland and the European Union.  What measures has the Commission taken or does it intend to take to ensure that the relevant Polish authorities stop demanding certification of this kind?