Who was the opposing team played at Riverfront Stadium?
{'header': ['Week', 'Date', 'Opponent', 'Location', 'Time ( ET )', 'TV', 'Result', 'Record'], 'page_title': '1989 Pittsburgh Steelers season', 'section_title': 'Schedule', 'caption': 'Schedule', 'rows': [['1', 'Sun. Sep. 10', 'Cleveland Browns', 'Three Rivers Stadium', '4:00pm', 'NBC', 'L 51–0', '0–1'], ['2', 'Sun. Sep. 17', 'at Cincinnati Bengals', 'Riverfront Stadium', '1:00pm', 'NBC', 'L 41–10', '0–2'], ['3', 'Sun. Sep. 24', 'Minnesota Vikings', 'Three Rivers Stadium', '1:00pm', 'CBS', 'W 27–14', '1–2'], ['4', 'Sun. Oct. 1', 'at Detroit Lions', 'Pontiac Silverdome', '1:00pm', 'NBC', 'W 23–3', '2–2'], ['5', 'Sun. Oct. 8', 'Cincinnati Bengals', 'Three Rivers Stadium', '1:00pm', 'NBC', 'L 26–16', '2–3'], ['6', 'Sun. Oct. 15', 'at Cleveland Browns', 'Cleveland Municipal Stadium', '4:00pm', 'NBC', 'W 17–7', '3–3'], ['7', 'Sun. Oct. 22', 'at Houston Oilers', 'Astrodome', '1:00pm', 'NBC', 'L 27–0', '3–4'], ['8', 'Sun. Oct. 29', 'Kansas City Chiefs', 'Three Rivers Stadium', '1:00pm', 'NBC', 'W 23–17', '4–4'], ['9', 'Sun. Nov. 5', 'at Denver Broncos', 'Mile High Stadium', '4:00pm', 'NBC', 'L 34–7', '4–5'], ['10', 'Sun. Nov. 12', 'Chicago Bears', 'Three Rivers Stadium', '1:00pm', 'CBS', 'L 20–0', '4–6'], ['11', 'Sun. Nov. 19', 'San Diego Chargers', 'Three Rivers Stadium', '1:00pm', 'NBC', 'W 20–17', '5–6'], ['12', 'Sun. Nov. 26', 'at Miami Dolphins', 'Joe Robbie Stadium', '1:00pm', 'NBC', 'W 34–14', '6–6'], ['13', 'Sun. Dec. 3', 'Houston Oilers', 'Three Rivers Stadium', '1:00pm', 'NBC', 'L 23–16', '6–7'], ['14', 'Sun. Dec. 10', 'at New York Jets', 'Giants Stadium', '1:00pm', 'NBC', 'W 13–0', '7–7'], ['15', 'Sun. Dec. 17', 'New England Patriots', 'Three Rivers Stadium', '1:00pm', 'NBC', 'W 28–10', '8–7']]}