Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:The response to a generated question will be supplied in the following conversations, which may be novel but not necessarily occur in the input as that in traditional QG (Du et al., 2017; Yuan et al., 2017; Tang et al., 2017; Wang et al., 2017; Mostafazadeh et al., 2016).
Category: