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 Name | Circuit | Date | Winning driver | Constructor | Report |
| --- | --- | --- | --- | --- | --- |
| XI Gran Premio Ciudad de Buenos Aires | Buenos Aires | 27 January | Juan Manuel Fangio | Maserati | Report |
| VII Gran Premio di Siracusa | Syracuse | 7 April | Peter Collins | Lancia - Ferrari | Report |
| XVII Pau Grand Prix | Pau | 22 April | Jean Behra | Maserati | Report |
| V Glover Trophy | Goodwood | 22 April | Stuart Lewis-Evans | Connaught - Alta | Report |
| X Gran Premio di Napoli | Posillipo | 28 April | Peter Collins | Lancia - Ferrari | Report |
| XXIII Grand Prix de Reims | Reims-Gueux | 14 July | Luigi Musso | Lancia - Ferrari | Report |
| V Grand Prix de Caen | Caen | 28 July | Jean Behra | BRM | Report |
| IX BRDC International Trophy | Silverstone | 14 September | Jean Behra | BRM | Report |
| V Gran Premio di Modena | Modena | 22 September | Jean Behra | Maserati | Report |
| VI Grand Prix de Maroc | Ain-Diab | 27 October | Jean Behra | Maserati | Report |
Question:
Which date was the x gran premio di napoli?
Answer:
28 April