Sadly, filtering by the colleges that offer Medicine won’t help you very much, as all of the following offer the course:
Balliol College, Brasenose College, Christ Church, Corpus Christi College, Exeter College, Hertford College, Jesus College, Keble College, Lady Margaret Hall, Lincoln College, Magdalen College, Merton College, New College, Oriel College, Pembroke College, The Queen’s College, St Anne’s College, St Catherine’s College, St Edmund Hall, St Hilda’s College, St Hugh’s College, St John’s College, St Peter’s College, Somerville College, Trinity College, University College, Wadham College, Worcester College