| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | XVIII Reserve Corps (German Empire) - Structure on formation |  |  |  |
| 3 | Corps | Division | Brigade | Units |
| 4 | XVIII Reserve Corps | 21st Reserve Division | 41st Reserve Infantry Brigade | 80th Reserve Infantry Regiment |
| 5 | XVIII Reserve Corps | 21st Reserve Division | 41st Reserve Infantry Brigade | 87th Reserve Infantry Regiment |
| 6 | XVIII Reserve Corps | 21st Reserve Division | 42nd Reserve Infantry Brigade | 81st Reserve Infantry Regiment |
| 7 | XVIII Reserve Corps | 21st Reserve Division | 42nd Reserve Infantry Brigade | 88th Reserve Infantry Regiment |
| 8 | XVIII Reserve Corps | 21st Reserve Division | - | 7th Reserve Dragoon Regiment |
| 9 | XVIII Reserve Corps | 21st Reserve Division | - | 21st Reserve Field Artillery Regiment |
| 10 | XVIII Reserve Corps | 21st Reserve Division | - | 4th Company, 11th Pioneer Battalion |
| 11 | XVIII Reserve Corps | 21st Reserve Division | - | 21st Reserve Divisional Pontoon Train |
| 12 | XVIII Reserve Corps | 21st Reserve Division | - | 17th Reserve Medical Company |
| 13 | XVIII Reserve Corps | 25th Reserve Division | 49th Reserve Infantry Brigade | 116th Reserve Infantry Regiment |
| 14 | XVIII Reserve Corps | 25th Reserve Division | 49th Reserve Infantry Brigade | 118th Reserve Infantry Regiment |
| 15 | XVIII Reserve Corps | 25th Reserve Division | 50th Reserve Infantry Brigade | 168th Infantry Regiment |
| 16 | XVIII Reserve Corps | 25th Reserve Division | 50th Reserve Infantry Brigade | 83rd Reserve Infantry Regiment |
| 17 | XVIII Reserve Corps | 25th Reserve Division | - | 4th Reserve Dragoon Regiment |
| 18 | XVIII Reserve Corps | 25th Reserve Division | - | 25th Reserve Field Artillery Regiment |
| 19 | XVIII Reserve Corps | 25th Reserve Division | - | 1st Reserve Company, 11th Pioneer Battalion |
| 20 | XVIII Reserve Corps | 25th Reserve Division | - | 2nd Reserve Company, 11th Pioneer Battalion |
| 21 | XVIII Reserve Corps | 25th Reserve Division | - | 25th Reserve Divisional Pontoon Train |
| 22 | XVIII Reserve Corps | 25th Reserve Division | - | 18th Reserve Medical Company |
| 23 | XVIII Reserve Corps | Corps Troops | - | 18th Reserve Telephone Detachment |
| 24 | XVIII Reserve Corps | Corps Troops | - | Munition Trains and Columns corresponding to the III Reserve Corps |

Question: How many Infantry Regiments were included in the XVIII Reserve Corps, and what is the number of the regiment?
Answer: XVIII Reserve Corps included one Infantry Regiment (168th).