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:
| Date | Course | Distance | Type | Winner |
| --- | --- | --- | --- | --- |
| 15 May | Agrigento to Modica | km (mi) | Flat stage | Ivan Quaranta ( ITA ) |
| 16 May | Noto to Catania | km (mi) | Flat stage | Mario Cipollini ( ITA ) |
| 17 May | Catania to Messina | km (mi) | Flat stage | Jeroen Blijlevens ( NED ) |
| 18 May | Vibo Valentia to Terme Luigiane | km (mi) | Medium mountain stage | Laurent Jalabert ( FRA ) |
| 19 May | Terme Luigiane to Massiccio del Sirino | km (mi) | Medium mountain stage | José Jaime González ( COL ) |
| 20 May | Lauria to Foggia | km (mi) | Flat stage | Romāns Vainšteins ( LAT ) |
| 21 May | Foggia to Lanciano | km (mi) | Flat stage | Jeroen Blijlevens ( NED ) |
| 22 May | Pescara to Gran Sasso d'Italia | km (mi) | Mountain stage | Marco Pantani ( ITA ) |
| 23 May | Ancona to Ancona | km (mi) | Individual time trial | Laurent Jalabert ( FRA ) |
| 24 May | Ancona to Sansepolcro | km (mi) | Medium mountain stage | Mario Cipollini ( ITA ) |
| 25 May | Sansepolcro to Cesenatico | km (mi) | Flat stage | Ivan Quaranta ( ITA ) |
| 26 May | Cesenatico to Sassuolo | km (mi) | Flat stage | Mario Cipollini ( ITA ) |
| 27 May | Sassuolo to Rapallo | km (mi) | Medium mountain stage | Richard Virenque ( FRA ) |
| 28 May | Rest day | Rest day | Rest day | Rest day |
| 29 May | Bra to Borgo San Dalmazzo | km (mi) | Mountain stage | Paolo Savoldelli ( ITA ) |
| 30 May | Racconigi to Santuario di Oropa | km (mi) | Mountain stage | Marco Pantani ( ITA ) |
| 31 May | Biella to Lumezzane | km (mi) | Flat stage | Laurent Jalabert ( FRA ) |
| 1 June | Lumezzane to Castelfranco Veneto | km (mi) | Flat stage | Mario Cipollini ( ITA ) |
| 2 June | Treviso to Treviso | km (mi) | Individual time trial | Serhiy Honchar ( UKR ) |
| 3 June | Castelfranco Veneto to Alpe di Pampeago | km (mi) | Mountain stage | Marco Pantani ( ITA ) |
| 4 June | Predazzo to Madonna di Campiglio | km (mi) | Mountain stage | Marco Pantani ( ITA ) |
| 5 June | Madonna di Campiglio to Aprica | km (mi) | Mountain stage | Roberto Heras ( ESP ) |
| 6 June | Darfo Boario Terme to Milan | km (mi) | Flat stage | Fabrizio Guidi ( ITA ) |
| Total | Total | km (mi) | km (mi) | km (mi) |
Question:
What was the course type on 22 May?
Answer:
Mountain stage