user: Question: Which company's principal activities are Catering services, and a Group's Equity Shareholding (as of March 10th 2010) of 40%?
Columns: ['Company', 'Type', 'Principal activities', 'Incorporated in', "Group's Equity Shareholding (10 March 2010)"]
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Air China', 'Corporate', 'Airline', 'China', '18.77%']
SQL:

assistant: SELECT "Company" FROM "Table" WHERE "Principal activities" = 'Catering services' AND "Group's Equity Shareholding (10 March 2010)" = '40%';