Apollo Rx Query With Single

Apollo Android Client support RxJava2. They support

1. Observable< Response< T> >
2. Single
3. Completable

From official doc

val query = EpisodeHeroNameQuery(episode = Episode.EMPIRE.toInput())
val observable = apolloClient.rxQuery(query)

apolloClient.rxQuery returns a Observable, But I want to use Single here. How can i use Single here