In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Context_1 : Wendell Edward Tucker (born September 4, 1943) is a former professional American football player who played wide receiver for four seasons for the Los Angeles Rams. Tucker spent most of his first season on the "taxi-squad" while learning behind the Rams' starting flanker Bernie Casey. Tucker saw action in 10 of the team's 14 games in 1968 (catching only 7 passes but 4 of them went for touchdowns), and then became the starting flanker after Casey's retirement. The 1969 season would prove to be his most productive as, playing opposite wide receiver Jack Snow, he caught 38 passes for 629 yards and 7 touchdowns, including a 93 yarder vs. the 49ers for the Coastal Division champion Rams. Tucker returned in 1970 but was hampered by injuries and caught only 12 passes in 12 games. In May 1971, Tucker was traded along with Billy Truax to the Dallas Cowboys for receiver Lance Rentzel. However, unable to regain his trademark speed because of a knee injury, Tucker retired before the start of the 1971 season. Context_2 : The Minnesota Vikings season was the 30th year season for the Minnesota Vikings and the 71st regular season of the National Football League. The Vikings finished with a record of six wins and ten losses. After beginning the season 11, the Vikings dropped their next five games and found themselves at 16. However, they caught fire mid-season with a five-game winning streak to even their record at 66 (including a 4113 thumping of the eventual NFC Central champion Chicago Bears in Week 12). While being in the thick of the wild card race, the Vikings suddenly fell apart with a four-game losing streak to finish at 610. Context_3 : The Minnesota Vikings season was the 34th year of season play for the Minnesota Vikings and the 75th regular season of the National Football League. The Vikings finished with a record of ten wins and six losses. For the third straight season in the Dennis Green era, the Vikings did not make it out of the Wild Card round, losing 35-18 to the rival Chicago Bears. Context_4 : Edward McDaniel (born March 23, 1969) is a former American football linebacker in the NFL. He was drafted by the Minnesota Vikings, 5th round (125th overall) of the 1992 Draft. He spent his entire professional career with the Minnesota Vikings. Context_5 : The 1962 Minnesota Vikings season was the second year of season play for the Minnesota Vikings and the 43rd regular season of the National Football League. The Vikings finished with a record of two wins, 11 losses, and one tie under head coach Norm Van Brocklin. The 2-11-1 record still stands as the Vikings' worst season record by terms of winning percentage, both by today's standards (.179) and back then (.154), where ties weren't counted as games played. The Vikings have won at least three games in every season since. Context_6 : Thomas Lance Rentzel (born October 14, 1943) is a former American football flanker in the National Football League (NFL) for the Minnesota Vikings, Dallas Cowboys and the Los Angeles Rams. He played college football at the University of Oklahoma. Context_7 : The Minnesota Vikings season was the 37th year of season play for the Minnesota Vikings and the 78th regular season of the National Football League. The Vikings finished with a record of nine wins and seven losses. Their record was good enough to qualify for a wild card berth. In the wild card round against the New York Giants, the Vikings came back from a 2213 deficit with 90 seconds to play to defeat the Giants 2322. It was their first playoff victory since 1988 and their first under head coach Dennis Green. In the Divisional round, the Vikings were defeated by the San Francisco 49ers, 3822. Context_8 : The Minnesota Vikings season was the 35th year of season play for the Minnesota Vikings and the 76th regular season of the National Football League. The Vikings finished with a record of eight wins and eight losses. The Vikings however had a chance to still make the playoffs entering Week 17 at Cincinnati. But with the Bears and the Falcons winning their games to fight for the final spot in the playoffs, it was too much to overcome for Minnesota to clinch. This was the first time the Vikings had not reached the playoffs under Green. Context_9 : The 1964 Minnesota Vikings season was the fourth year of season play for the Minnesota Vikings and the 45th regular season of the National Football League. The Vikings finished with a record of eight wins, five losses, and one tie under head coach Norm Van Brocklin. The eight wins was the most at the time in the franchise's four-year history. To date, this is the only season the Vikings wore white jerseys for their home games. Context_10 : The Minnesota Vikings Cheerleaders are the official cheer squad for the Minnesota Vikings. The squad performs at every home game at the U.S. Bank Stadium, the home stadium of Minnesota. Before the squad's introduction in 1984, The Vi-Queens (196163) and the St. Louis Park High School Parkettes performed (196483). In 1984, the MVC were started. The group currently has 35 members. The squad, like other groups in the league, releases a swimsuit calendar annually since 2001. The squad also makes off-field appearances at parades, schools, and charity events. Like other NFL cheerleading squads, the MVC also has a "Junior Minnesota Vikings Cheerleaders" program, which has various divisions: Junior Angel Division is for girls aged 35, and Junior Cheerleader Division is for girls aged 614. In April, the MVC hosts tryouts at Winter Park. fact_1 : Wendell Edward Tucker (born September 4, 1943) is a former professional American football player who played wide receiver for four seasons for the Los Angeles Rams. fact_2 : In May 1971, Tucker was traded along with Billy Truax to the Dallas Cowboys for receiver Lance Rentzel. fact_3 : Thomas Lance Rentzel (born October 14, 1943) is a former American football flanker in the National Football League (NFL) for the Minnesota Vikings, Dallas Cowboys and the Los Angeles Rams. Answer: Lance Rentzel
Who was traded by the Minnesota Vikings for Wendal Edward Tucker in May 1971?