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 |
| --- | --- | --- | --- | --- | --- |
| I Rostock Osthafenkurs | Rostock | 20 April | Paul Greifzu | BMW - Eigenbau | Report |
| I Bernau Autobahnschleife | Bernau | 4 May | Rudolf Krause | BMW - Reif | Report |
| I Dessau Autobahnspinne | Dessau | 11 May | Fritz Riess | Veritas-Meteor | Report |
| III Leipzig Stadtparkrennen | Leipzig | 2 June | Edgar Barth | IFA - Kollektiv | Report |
| III Strassen-Rennen Halle-Saale-Schleife | Halle-Saale-Schleife | 8 June | Edgar Barth | IFA - Kollektiv | Report |
| I Strassen-rennen Leipzig | Leipzig | 17 August | Hans Stuck | AFM - BMW | Report |
| V DMV Grenzlandringrennen | Grenzlandring | 31 August | Toni Ulmen | Veritas | Report |
Question:
Which races did Paul Greifzu win?
Answer:
I Rostock Osthafenkurs