Classify this article as one of these three topics: politics, science, sports.
A new study by the National Institutes of Health shows that drinking green tea helps reduce the risk of cancer.
The topic of this article is science.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify this article as one of these three topics: politics, science, sports.

### Input:
A new study by the National Institutes of Health shows that drinking green tea helps reduce the risk of cancer.

### Output:
The topic of this article is science.