<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
why do a lot of diseases often start in china?
<|assistant|>
Diseases often start in China because of its large population size and high level of industrial development. As more people live in close proximity and there is increased contact with potential sources of infection, the greater the opportunity for the transmission of disease from person to person. Additionally, China's large population leads to increased pressure on already strained resources, such as water and sanitation, which can create prime environments for the spread of disease. Finally, a high level of industrialization has led to increasing amounts of air and water pollution, contributing to increased risk factors for communicable diseases.