You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "When was the supermarket founded by   Mary Ann Sainsbury's husband founded?" whose answer is 1869.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Mary Ann Sainsbury's husband and the founding year of his supermarket
Useful Output:

Doc 1: It was 1869 when John James Sainsbury and his wife Mary Ann opened the first Sainsbury's store on London's Drury Lane. The business didn't take
Doc 2: Mary Ann Sainsbury (née Staples; 30 June 1849 – 9 June 1927) was the wife of John James Sainsbury, the founder of the Sainsbury's supermarket chain.
Doc 3: In the early years Mary Ann worked alongside her husband in the shop, and was solely responsible for running the Drury Lane store for the first weeks after
Doc 4: In honour of International Women's Day, we're celebrating our co-founder Meet Mary Ann Sainsbury.
Doc 5: It was in 1869 that John James Sainsbury and his wife Mary Ann opened a dairy shop on Drury Lane in London.