[BioC] How to retrieve all GO terms at level 5 as well as their annotated genes

[Peter Davidsen]

Dear list,

I'm looking for a way to get the names of all Gene Ontology terms for
Biological Processes at level 5 as well as the genes (human gene
symbols) annotated to each of the level 5 GO terms.

I have tried to query the DAVID knowledgebase, but the online tool
doesn't seem to respond to any requests. Hence, could anybody maybe
point me in the direction of a package that could provide me with the
same information?

Kind regards,
Peter