What are the labels of responsive/retweet posts?

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Hi. Thank you for your sharing.

In your paper Rumor Detection on Social Media with Bi-Directional Graph Convolutional Networks, it is mentioned that GCN is applied on a graph, which uses source tweet r and its responsive/retweet posts as nodes. But in the dataset Twitter15/16, only source tweet has a label. What are the labels of these responsive/retweet posts? Maybe their labels are consistent with their source tweet?

Many thanks.