Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Race | Circuit | Date | Pole position | Fastest lap | Winning driver | Constructor | Tyre | Report |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Argentine Grand Prix | Oscar Gálvez | 16 January | José Froilán González | Juan Manuel Fangio | Juan Manuel Fangio | Mercedes | C | Report |
| Monaco Grand Prix | Monaco | 22 May | Juan Manuel Fangio | Juan Manuel Fangio | Maurice Trintignant | Ferrari | E | Report |
| Indianapolis 500 | Indianapolis | 30 May | Jerry Hoyt | Bill Vukovich | Bob Sweikert | Kurtis Kraft - Offenhauser | F | Report |
| Belgian Grand Prix | Spa-Francorchamps | 5 June | Eugenio Castellotti | Juan Manuel Fangio | Juan Manuel Fangio | Mercedes | C | Report |
| Dutch Grand Prix | Zandvoort | 19 June | Juan Manuel Fangio | Roberto Mieres | Juan Manuel Fangio | Mercedes | C | Report |
| British Grand Prix | Aintree | 16 July | Stirling Moss | Stirling Moss | Stirling Moss | Mercedes | C | Report |
| Italian Grand Prix | Monza | 11 September | Juan Manuel Fangio | Stirling Moss | Juan Manuel Fangio | Mercedes | C | Report |
Question:
Who was the constructor when Eugenio Castellotti was the pole position and the race had a C tyre?
Answer:
Mercedes