You will be presented with a citation segment from the section of a research paper. Classify the intent behind this citation by choosing from one of the following categories:

- Method: Cites the paper for its methodology or procedure.
- Background: Cites the paper to provide background information.
- Result: Cites the paper for its findings or results.

Your answer should be a single word from the following list of options: ["Method", "Background", "Result"]. Do not include any other text in your response.

Citation sentence:

C57 mice, however, have been reported to be more sensitive to the incentive properties of other drugs of abuse including amphetamine, cocaine, methamphetamine, or nicotine than DBA mice (for review see Crawley et al. 1997; Cabib et al. 2000; Orsini et al. 2004; 2005; Grabus et al. 2006).
Background