user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Summary of raiding history' regarding 'German submarine U-338'
Table Content:
| Date | Name | Nationality | Tonnage (GRT) | Fate |
| --- | --- | --- | --- | --- |
| 17 March 1943 | Alderamin | Netherlands | 7,886 | Sunk |
| 17 March 1943 | Fort Cedar Lake | United Kingdom | 7,134 | Damaged |
| 17 March 1943 | Granville | Panama | 4,071 | Sunk |
| 17 March 1943 | King Gruffydd | United Kingdom | 5,072 | Sunk |
| 17 March 1943 | Kingsbury | United Kingdom | 4,898 | Sunk |


Question
What British ships did the U-338 sink on March 17 and what were their tonnages?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["On March 17, U-338 sank two British merchant ships: the 4,898 ton Kingsbury, and the 5,072 ton King Gruffydd."]