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:
| Year | Car | Start | Qual | Rank | Finish | Laps | Led | Retired |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1961 | 98 | 5 | 146.080 | 7 | 12 | 192 | 27 | Flagged |
| 1962 | 98 | 1 | 150.370 | 1 | 7 | 200 | 120 | Running |
| 1963 | 98 | 1 | 151.153 | 1 | 1 | 200 | 167 | Running |
| 1964 | 98 | 4 | 155.099 | 4 | 23 | 55 | 7 | Pit fire |
| 1965 | 98 | 5 | 158.625 | 5 | 2 | 200 | 0 | Running |
| 1966 | 98 | 4 | 162.484 | 4 | 14 | 87 | 0 | Wheel Bearing |
| 1967 | 40 | 6 | 166.075 | 6 | 6 | 196 | 171 | Bearing |
| Totals | Totals | Totals | Totals | Totals | Totals | 1130 | 492 |  |
Question:
what is the most common cause for a retired car?
Answer:
Running