user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Ships sunk or damaged' regarding 'SM UB-16'
Table Content:
| Date | Name | Nationality | Tonnage | Fate |
| --- | --- | --- | --- | --- |
| 3 June 1915 | Boy Horace | United Kingdom | 69 | Sunk |
| 3 June 1915 | E&C | United Kingdom | 60 | Sunk |
| 3 June 1915 | Economy | United Kingdom | 56 | Sunk |
| 12 June 1915 | Leuctra | United Kingdom | 3,027 | Sunk |
| 23 June 1915 | Tunisiana | United Kingdom | 4,220 | Sunk |
| 27 July 1915 | Westward Ho! | United Kingdom | 47 | Sunk |
| 28 July 1915 | Mangara | United Kingdom | 1,821 | Sunk |
| 8 September 1915 | Emblem | United Kingdom | 50 | Sunk |
| 8 September 1915 | Victorious | United Kingdom | 43 | Sunk |
| 10 September 1915 | Nimrod | United Kingdom | 51 | Sunk |
| 18 January 1916 | Evelyn | United Kingdom | 55 | Sunk |
| 18 January 1916 | Foam Crest | United Kingdom | 46 | Sunk |
| 19 January 1916 | Sunshine | United Kingdom | 52 | Sunk |
| 6 March 1916 | Springflower | United Kingdom | 59 | Sunk |
| 6 March 1916 | Young Harry | United Kingdom | 43 | Sunk |
| 1 April 1916 | Perth | United Kingdom | 653 | Sunk |
| 3 April 1916 | Elziena Helena | Netherlands | 131 | Damaged |
| 10 April 1916 | Robert Adamson | United Kingdom | 2,978 | Sunk |
| 22 April 1916 | Tregantle | United Kingdom | 3,091 | Sunk |
| 2 August 1916 | John Wilson | Norway | 798 | Sunk |
| 24 August 1916 | Velox | Norway | 312 | Sunk |
| 20 April 1917 | Arie | Netherlands | 107 | Sunk |
| 26 April 1917 | Kongsli | Norway | 5,822 | Damaged |
| 9 August 1917 | HMS Recruit | Royal Navy | 1,075 | Sunk |
| 13 March 1918 | Lisette | United Kingdom | 895 | Sunk |
| 13 April 1918 | Ruth | United Kingdom | 44 | Sunk |
| - | Sunk: Damaged: Total: | 19,652 5,953 25,605 | - | - |


Question
Which British steamers did UB-16 sink in April 1916?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["UB-16 sank two British steamers: the 2,978-ton Robert Adamson on the 10thand the 3,091-ton Tregantle on the 22nd."]