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: "The manufacturer of Premarin was purchased by Pfizer in what year?" whose answer is 2009.
Each document should contain about 30 words, and these documents should contain useful information.

Query: purchase of manufacturer of Premarin by Pfizer
Useful Output:

Doc 1: Pfizer Inc., the world's largest drugmaker, said in a securities filing that it has paid $896 million to resolve about 60 percent of the cases
Doc 2: A Philadelphia jury on Friday ordered pharmaceutical giant Pfizer to pay $6.3 million in compensatory damages to an Illinois breast cancer survivor.
Doc 3: Wyeth, a drugmaker that Pfizer bought in October 2009, had been hit by thousands of lawsuits over its hormone replacement pills, Premarin
Doc 4: Provera is sold by Pharmacia & Upjohn, which Pfizer acquired in 2003. Pfizer, the world's biggest drugmaker, said it would challenge the latest
Doc 5:  PREMARIN®. (conjugated estrogens). PREMPRO®/PREMPHASE®. (conjugated estrogens/medroxyprogesterone acetate). PREPIDIL®. (dinoprostone). PREVNAR 13. (pneumococcal