Task: Table-QA (source dataset: TableBench)

Task: 
You are given a table containing structured data and a natural language question referring to the table. Your goal is to analyze the table and provide an accurate and concise answer based on the given data.

Instructions:
1. Understand the Table: Examine the structure, headers, and data in the table. Identify relevant columns and rows related to the question.
2. Interpret the Question: Determine whether the question requires direct retrieval, aggregation, comparison, sorting, filtering, or inference.
3. Extract the Answer: Use logical reasoning and numerical operations (if necessary) to derive the correct response from the table.
4. Format the Answer: No explanation, return the answer in a structured JSON format: {"answer": <answer>}. If the question cannot be answered due to missing or ambiguous data, return a JSON response with {"answer": null}.

Table:
|   year | mens singles        | womens singles       | mens doubles                        | womens doubles                        | mixed doubles                       |
|-------:|:--------------------|:---------------------|:------------------------------------|:--------------------------------------|:------------------------------------|
|   1985 | jeliazko valkov     | diana koleva         | ilko orechov nanko ertchopov        | diana koleva zlatka valkanova         | jeliazko valkov dobrinka peneva     |
|   1986 | jeliazko valkov     | diana koleva         | jeliazko valkov dinko dukov         | diana koleva petia borisova           | ilko okreshkov elena velinova       |
|   1987 | stanimir boitchinov | diana koleva         | jeliazko valkov dinko dukov         | diana koleva diana filipova           | jeliazko valkov gabriela spasova    |
|   1988 | jeliazko valkov     | diana koleva         | jeliazko valkov dinko dukov         | diana koleva emilia dimitrova         | jeliazko valkov irina dimitrova     |
|   1989 | stanimir boitchinov | diana koleva         | jeliazko valkov dinko dukov         | diana koleva emilia dimitrova         | jeliazko valkov diana filipova      |
|   1990 | stoyan ivantchev    | diana koleva         | slantcezar tzankov anatoliy skripko | diana koleva emilia dimitrova         | anatoliy skripko diana filipova     |
|   1991 | stoyan ivantchev    | victoria hristova    | stoyan ivantchev anatoliy skripko   | diana koleva emilia dimitrova         | jeliazko valkov emilia dimitrova    |
|   1992 | jassen borissov     | diana koleva         | jeliazko valkov sibin atanasov      | diana koleva diana filipova           | slantchezar tzankov diana filipova  |
|   1993 | todor velkov        | dimitrinka dimitrova | boris kesov anatoliy skripko        | victoria hristova nelly nedjalkova    | svetoslav stoyanov emilia dimitrova |
|   1994 | mihail popov        | victoria hristova    | svetoslav stoyanov mihail popov     | raina tzvetkova emilia dimitrova      | svetoslav stoyanov raina tzvetkova  |
|   1995 | todor velkov        | neli nedialkova      | svetoslav stoyanov mihail popov     | raina tzvetkoa victoria hristova      | svetoslav stoyanov raina tzvetkova  |
|   1996 | mihail popov        | victoria hristova    | svetoslav stoyanov mihail popov     | victoria hristova neli nedialkova     | svetoslav stoyanov raina tzvetkova  |
|   1997 | boris kessov        | raina tzvetkova      | svetoslav stoyanov mihail popov     | victoria hristova dobrinka smilianova | svetoslav stoyanov raina tzvetkova  |
|   1998 | mihail popov        | victoria hristova    | svetoslav stoyanov mihail popov     | victoria hristova raina tzvetkova     | svetoslav stoyanov raina tzvetkova  |
|   1999 | boris kessov        | neli boteva          | boris kessov tzvetozar kolev        | raina tzvetkova petya nedelcheva      | konstantin dobrev petya nedelcheva  |
|   2000 | luben panov         | petya nedelcheva     | konstantin dobrev luben panov       | petya nedelcheva neli boteva          | konstantin dobrev petya nedelcheva  |
|   2001 | konstantin dobrev   | petya nedelcheva     | konstantin dobrev luben panov       | petya nedelcheva maya ivanova         | konstantin dobrev petya nedelcheva  |
|   2002 | boris kessov        | petya nedelcheva     | konstantin dobrev georgi petrov     | petya nedelcheva nely boteva          | boris kessov nely boteva            |
|   2003 | georgi petrov       | nely boteva          | julian hristov boris kessov         | petya nedelcheva diana koleva         | julian hristov diana dimova         |
|   2004 | yulian hristov      | petya nedelcheva     | stilian makarski bladimir metodiev  | petya nedelcheva nely boteva          | vladimir metodiev petya nedelcheva  |
|   2005 | kostantin dobrev    | petya nedelcheva     | konstantin dobrev georgi petrov     | petya nedelcheva maya lvanova         | vladimir metodiev petya nedelcheva  |
|   2006 | georgi petrov       | petya nedelcheva     | georgi petrov blagovest kisiov      | petya nedelcheva diana dimova         | vladimir metodiev petya nedelcheva  |
|   2007 | georgi petrov       | petya nedelcheva     | vladimir metodiev stilian makarski  | petya nedelcheva diana dimova         | vladimir metodiev diana dimova      |
|   2008 | stilian makarski    | petya nedelcheva     | vladimir metodiev krasimir yankov   | petya nedelcheva diana dimova         | stilian makarski diana dimova       |
|   2009 | krasimir yankov     | petya nedelcheva     | vladimir metodiev krasimir yankov   | petya nedelcheva dimitria popstoykova | stilian makarski diana dimova       |
|   2010 | stilian makarski    | petya nedelcheva     | stilian makarski peyo boichinov     | petya nedelcheva diana dimova         | stilian makarski diana dimova       |
|   2011 | peyo boichinov      | petya nedelcheva     | stilian makarski peyo boichinov     | petya nedelcheva diana dimova         | stilian makarski diana dimova       |

Question:
Which player, who has won the men's singles title at least twice, also won the mixed doubles title in the same year?


id: d494234ecc77e5ad04517a99c500b01b
qtype: FactChecking
label: jeliazko valkov