user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Tracks opened' regarding '1940 UK & Ireland Greyhound Racing Year'
Table Content:
| Date | Stadium/Track | Location |
| --- | --- | --- |
| 23 March | Sunderland Greyhound Stadium | Sunderland |
| 1 April | Mains Park | Linlithgow |
| 11 May | Yarmouth Stadium | Yarmouth |


Question
On what dates did Sunderland Greyhound Stadium and Yarmouth Stadium open?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Sunderland Greyhound Stadium opened on 23 March and Yarmouth Stadium opened on 11 May."]