From "The Gulag Archipelago" by Aleksandr Solzhenitsyn, part 1 chapter 3 "The Interrogation" (bracketed clarifications added):
N. Stolyarova recalls an old woman who was her neighbor on the Butyrki bunks [in lockup] in 1937. They kept on interrogating her every night. Two years earlier, a former Metropolitan of the Orthodox Church, [equiv to a bishop or perhaps archbishop] who had escaped from exile, had spent a night at her home on his way through Moscow.
LADY: "But he wasn't the former Metropolitan, he was the Metropolitan! Truly I was worthy of receiving him."
INTERROGATOR: "All right then. To whom did he go when he left Moscow?"
LADY: "I know, but I won't tell you!"
Did the old lady lie to the interrogators? Was she morally obligated to answer their question as it was stated? I believe that the answer to both questions is "no".