Question: Girls' Generation-TTS (, also known as TTS, TaeTiSeo, or Girls' Generation-TaeTiSeo) is a subgroup of South Korean girl group Girls' Generation, formed by S.M. Entertainment in 2012, is composed of three Girls' Generation members: Taeyeon, Tiffany, and which South Korean singer and actress, known professionally as Seohyun, born in which year ?
{'answer': '1991', 'supporting_facts': [["Girls' Generation-TTS", 1], ['Seohyun', 0]]}