<s>[INST] The next text is a question of a member of the European parliament:"How many policy areas required a unanimous vote in the Council of Ministers in 1973, when the UK joined the EU? Will the Commission please list those which have since been removed?"
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 = [20]. </s>
How many policy areas required a unanimous vote in the Council of Ministers in 1973, when the UK joined the EU? Will the Commission please list those which have since been removed?