Question: What is the nationality of this professional footballer who was sold to Chelsea during the 2004–05 Olympique de Marseille season?

full_context: Document 1: Frédéric Kanouté: Frédéric Oumar Kanouté (born 2 September 1977) is a retired Malian professional footballer who played as a striker for several top-tier clubs in Europe, enjoying his greatest success with La Liga side Sevilla FC. Kanouté was named the 2007 African Footballer of the Year, the first player born outside Africa to win the award.
Document 2: Diego Costa: Diego da Silva Costa (] , ] ; born 7 October 1988), is a professional footballer who plays as a striker for Premier League club Chelsea and the Spain national team. He has been described by pundits as a talented striker whose main attributes are his physicality, goalscoring and ability to keep possession. Costa has been criticised and punished for several confrontations with opponents.
Document 3: 2003–04 Olympique de Marseille season: Olympique de Marseille returned to the UEFA Champions League for the first time in four years, and in spite of going out in the group stage, the side made headlines in the UEFA Cup, knocking Liverpool, Internazionale and Newcastle United out on the way to the final, where the sending off of goalkeeper Fabien Barthez and the converted penalty kick from Valencia's Vicente saw Valencia eventually edge the game.
Document 4: 2004–05 Olympique de Marseille season: Olympique de Marseille had a disappointing season, with three managers passing by en route to a fifth-place finish in Ligue 1 and two premature domestic cup exits. With striker Didier Drogba being sold to Chelsea, and replacements Habib Bamogo and Péguy Luyindula not performing at a similar level, the goal-scoring went dry, but in spite of scoring two points less than the previous season, l'OM finished two positions above the previous season.
Document 5: 2004–05 FC Porto season: FC Porto followed up its UEFA Champions League victory with a chaotic season, following the departure of coach José Mourinho and several key players. Initial coach Luigi Delneri was sacked even before the season started, due to too little presence in his new town in pre-season. New signings Ricardo Quaresma, Pepe, Giourkas Seitaridis, Luís Fabiano, Raul Meireles and Diego looked spectacular on paper, but in reality, Porto had a miserable offensive performance, culminating in just 39 league goals and a loss of the league title to arch rivals Benfica. As a consolation, it won the Intercontinental Cup title with a victory against Once Caldas on penalties.
Document 6: 2009–10 Genoa C.F.C. season: Genoa C.F.C. had a mixed season, in which it struggled to replace world-class striker Diego Milito, who moved on to Internazionale, where he was key in it winning the treble in 2010. Such a player was difficult to find on the market, and his Argentinian replacements Hernán Crespo and Rodrigo Palacio lacked the final punch. Crespo had it in his younger years, of course, but despite four goals in the autumn, he was offloaded to Parma, as Genoa put its faith in David Suazo for the goalscoring. Sergio Floccari also departed, and the Lazio signing scored more goals for the Roman club in half the year than what any player did for Genoa the whole season, while Suazo became a flop. The defence did not perform at expected level either, and even though the team scored several goals by many players, the defensive holes ensured the team did not repeat the fifth position from the year before.
Document 7: 2003–04 Bayer 04 Leverkusen season: Bayer 04 Leverkusen bounced back from the nearly disastrous season it came from, finishing in the top three and qualifying for the UEFA Champions League in the process. The season marked the breakthrough for Bulgarian striker Dimitar Berbatov, who scored 16 goals, whereas Brazilian signing França contributed with 14 strikes. As it was, it was the attack that impressed the most, especially in the 6–2 crushing of champions Werder Bremen on the penultimate day of the season.
Document 8: Dimitar Berbatov: Dimitar Ivanov Berbatov (Bulgarian: Димитър Иванов Бербатов ] ; born 30 January 1981) is a Bulgarian professional footballer who plays for Indian Super League club Kerala Blasters. A striker, he captained the Bulgaria national team from 2006 to 2010, and is the country's all-time leading goalscorer. He has also won the Bulgarian Footballer of the Year a record seven times, surpassing the number of wins by Hristo Stoichkov.
Document 9: 2002–03 FC Schalke 04 season: FC Schalke 04 had another disappointing season, in which it failed to qualify for the Champions League. New coach Frank Neubarth did not last long, and was sacked and replaced by captain Marc Wilmots in the dugout. Once again, goalscoring was at a premium, with top scorer Victor Agali managing only seven in total. The end result was 7th place in Bundesliga, barely even qualifying for the Intertoto Cup.
Document 10: Pierre-Emerick Aubameyang: Pierre-Emerick Emiliano François Aubameyang (] ; born 18 June 1989) is a French-born Gabonese professional footballer who plays for German Bundesliga club Borussia Dortmund and the Gabon national team. He is known for his speed, having clocked 30 metres in 3.7 seconds, and his capability of playing as a forward or a winger.
Document 11: Didier Drogba: Didier Yves Drogba Tébily (] ; born 11 March 1978) is an Ivorian professional footballer who plays as a striker for American club Phoenix Rising FC. He is the all-time top scorer and former captain of the Ivory Coast national team. He is best known for his career at Chelsea, for whom he has scored more goals than any other foreign player and is currently the club's fourth highest goal scorer of all time. He has been named African Footballer of the Year twice, winning the accolade in 2006 and 2009.
Document 12: 2004–05 Atlético Madrid season: Atlético de Madrid had a largely disappointing season, where the club stalled in its progress towards the internationally qualifying positions. Despite Fernando Torres continuing to score more than a dozen goals per season, consolidating his status as Spain's top young striker, Atlético were only able to score 40 league goals. That rendered the successful defence of Luis Perea and Pablo Ibáñez vital just to keep the club in mid-table.
Document 13: 2002–03 Olympique de Marseille season: Olympique de Marseille almost won the French League for the first time in 11 years, having a remarkable run to third place, having only scored five goals more than it conceded. The most praised player was central defender Daniel Van Buyten, who was able to tighten up the defence, and also helping out with scoring several important goals. Without Marseille's goalscoring woes, it could have sustained a more serious title assault. Therefore it signed late-blooming starlet Didier Drogba from En Avant Guingamp, a move that was set to be among the best financial deals in the clubs' history.
Document 14: Dwayne De Rosario: Dwayne Anthony De Rosario (born May 15, 1978) is a retired Canadian professional soccer player, who played as a forward or as an attacking midfielder. A versatile attacker, he played for the Toronto Lynx, FSV Zwickau and Richmond Kickers early in his career. He came to prominence in the 2000s playing in Major League Soccer for the San Jose Earthquakes, Houston Dynamo, Toronto FC, New York Red Bulls and D.C. United. A four-time MLS Cup champion, he also won the 2011 MLS Most Valuable Player award. He is the sixth-leading scorer in MLS history with 104 goals.
Document 15: Emmanuel Adebayor: Sheyi Emmanuel Adebayor (] ; born 26 February 1984) is a Togolese professional footballer who plays as a striker for Turkish club İstanbul Başakşehir. He previously played for English clubs Arsenal, Manchester City, Tottenham Hotspur and Crystal Palace, as well as French sides Metz and Monaco and Spanish team Real Madrid. He was voted African Footballer of the Year for 2008 while playing at Arsenal.
ground_truth: Ivorian