Select the most appropriate idiom to fill the blank in the given situation: I thought Sadhna would always stick by me, but when I got into trouble, she turned out to be a/an ___________.

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The phrase 'fair-weather friend' refers to someone who is only a friend during good times but abandons you in times of trouble. In the given sentence, Sadhna is expected to stick by the speaker but does not when trouble arises, making 'fair-weather friend' the most appropriate idiom. 'White elephant' means something costly and useless, 'hard nut to crack' means a difficult problem or person, and 'open secret' means something widely known but supposed to be secret, none of which fit the context.

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