Which word is missing from the title of the swimming event held at the 2015 World Aquatics Championships in which Christopher Walker-Hebborn, Adam Peaty, Siobhan-Marie O’Connor and Francesca Halsall won the gold medal for Great Britain - 4 × 100 metre ______ medley relay?
Mixed Mixed (disambiguation) Mlxed MIXED
mlxed mixed disambiguation mixed
mixed
WikipediaEntity
MIXED