Marta (The Time of the Doctor)
From Tardis Wiki, the free Doctor Who reference
Marta was an inhabitant of a town called Christmas. She was coupled with Abramal. She told the Eleventh Doctor and Clara Oswald about the truth field.
When asked if they liked the truth field, Marta said, "Yes", the same time as Abramal said, "No." (TV: The Time of the Doctor)
