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:
| Game | Date | Opponent | Score | Record |
| --- | --- | --- | --- | --- |
| 38.0 | 1/1/1974 | at New York Knicks | 89 - 99 | 19 - 19 |
| 39.0 | 1/2/1974 | Phoenix Suns | 113 - 116 | 19 - 20 |
| 40.0 | 1/5/1974 | Cleveland Cavaliers | 99 - 86 | 20 - 20 |
| 41.0 | 1/6/1974 | at Buffalo Braves | 109 - 117 | 20 - 21 |
| 42.0 | 1/8/1974 | at Buffalo Braves | 96 - 100 | 20 - 22 |
| 43.0 | 1/10/1974 | Chicago Bulls | 104 - 116 | 20 - 23 |
| 44.0 | 1/11/1974 | at Philadelphia 76ers | 100 - 121 | 20 - 24 |
| 45.0 | 1/13/1974 | Boston Celtics | 105 - 128 | 20 - 25 |
| 46.0 | 1/17/1974 | Portland Trail Blazers | 126 - 99 | 21 - 25 |
| 47.0 | 1/18/1974 | at Boston Celtics | 94 - 98 | 21 - 26 |
| 48.0 | 1/19/1974 | Seattle SuperSonics | 127 - 109 | 22 - 26 |
| 49.0 | 1/22/1974 | at Chicago Bulls | 89 - 102 | 22 - 27 |
| 50.0 | 1/23/1974 | Houston Rockets | 104 - 115 | 22 - 28 |
| 51.0 | 1/26/1974 | Buffalo Braves | 132 - 122 | 23 - 28 |
| 52.0 | 1/27/1974 | New York Knicks | 89 - 111 | 23 - 29 |
| 53.0 | 1/29/1974 | at Cleveland Cavaliers | 111 - 118 | 23 - 30 |
| 54.0 | 1/30/1974 | Golden State Warriors | 122 - 129 | 23 - 31 |
Question:
What opponent played on 1/13/1974?
Answer:
Boston Celtics