user: Question: What is the diameter in km of T'ien Hu Colles?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Akkruva Colles', '46.1N', '115.5E', 1059.0, 1985.0]
SQL:

assistant: SELECT "Diameter (km)" FROM "Table" WHERE "Name" = 'T''ien Hu Colles';