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 did the one child policy start in china?" whose answer is 1979.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the one child policy start in china
Useful Output:

Doc 1: A Chinese woman holds an infant in her arms while sitting in a gray armchair.  The one-child policy was introduced to China in 1979, written
Doc 2: For 35 years – from 1980 to 2015 – the Chinese government maintained a one-child policy, subjecting millions of women to forced contraception,
Doc 3: The Party launched its one-child policy in 1980, at a time when misplaced Malthusian fears could be found far beyond China's borders.
Doc 4: The one-child policy was a Chinese government program initiated in the late 1970s and early '80s. The policy was intended to limit China's accelerating
Doc 5: China's one-child policy was rolled out in 1980 by Deng Xiaoping and was strictly enforced after the population had increased to 969 million in 1980.