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:
| Stage | Winner | General classification | Points classification | Young rider classification | Team classification |
| --- | --- | --- | --- | --- | --- |
| P | Thierry Marie | Thierry Marie | Thierry Marie | Jesus Blanco Villar | Système U |
| 1 | Pol Verschuere | Alex Stieda | Pol Verschuere | Alex Stieda | Système U |
| 2 | Système U-Gitane | Thierry Marie | Eric Vanderaerden | Eric Boyer | Système U |
| 3 | Davis Phinney | Thierry Marie | Eric Vanderaerden | Eric Boyer | Système U |
| 4 | Pello Ruiz Cabestany | Dominique Gaigne | Eric Vanderaerden | Eric Boyer | Système U |
| 5 | Johan van der Velde | Johan van der Velde | Eric Vanderaerden | Eric Boyer | Système U |
| 6 | Guido Bontempi | Johan van der Velde | Eric Vanderaerden | Eric Boyer | Système U |
| 7 | Ludo Peeters | Jørgen V. Pedersen | Eric Vanderaerden | Eric Boyer | Carrera-Inoxpran |
| 8 | Eddy Planckaert | Jørgen V. Pedersen | Eric Vanderaerden | Eric Boyer | Carrera-Inoxpran |
| 9 | Bernard Hinault | Jørgen V. Pedersen | Eric Vanderaerden | Bruno Cornillet | Carrera-Inoxpran |
| 10 | Angel Sarrapio | Jørgen V. Pedersen | Eric Vanderaerden | Bruno Cornillet | Carrera-Inoxpran |
| 11 | Rudy Dhaenens | Jørgen V. Pedersen | Eric Vanderaerden | Bruno Cornillet | Carrera-Inoxpran |
| 12 | Pedro Delgado | Bernard Hinault | Eric Vanderaerden | Jean-François Bernard | La Vie Claire |
| 13 | Greg LeMond | Bernard Hinault | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 14 | Niki Rüttimann | Bernard Hinault | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 15 | Frank Hoste | Bernard Hinault | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 16 | Jean-François Bernard | Bernard Hinault | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 17 | Eduardo Chozas | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 18 | Bernard Hinault | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 19 | Julián Gorospe | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 20 | Bernard Hinault | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 21 | Erich Maechler | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 22 | Guido Bontempi | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| 23 | Guido Bontempi | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
| Final | Final | Greg LeMond | Eric Vanderaerden | Andrew Hampsten | La Vie Claire |
Question:
What Young rider classification has a Stage of 18?
Answer:
Andrew Hampsten