human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Type, Person(s), Publisher(s), Publication date, Reported price
###Question: What was the publication date of the photos of Sean Preston Federline that cost $500,000 and were published by People?
gpt
SELECT Publication date FROM table WHERE Reported price = $500,000 AND Publisher(s) = people AND Person(s) = sean preston federline