| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Rena Kato - With AKB48 |  |  |  |  |
| 3 | Year | No. | Title | Role | Notes |
| 4 | 2010 | 19 | "Chance no Junban" | B-side | Her very first single appearance in AKB48. Did not participate in title track. |
| 5 | 2011 | 20 | "Sakura no Ki ni Narō" | B-side | Did not participate in title track. Sang on the track "Ougon Center" as Team Kenkyuusei. |
| 6 | 2011 | 21 | "Everyday, Katyusha" | B-side | Did not participate in title track. Sang on the track "Anti" as Team Kenkyuusei. |
| 7 | 2011 | 23 | "Kaze wa Fuiteiru" | B-side | Did not participate in title track. Sang on the track "Kimi No Senaka" as Undergirls, and on "Tsubomitachi" as Team 4 + Kenkyuusei. |
| 8 | 2012 | 25 | "Give Me Five!" | Special Girls A | Did not participate in title track. Sang on the track "New Ship" as part of Special Girls A. |
| 9 | 2012 | 26 | "Manatsu no Sounds Good!" | A-side, Selection 10 | Her very first participation on an A-side. Also sang on the track "Choudai, Darling!" as part of Selection 10. |
| 10 | 2012 | 27 | "Gingham Check" | B-side | Did not rank on the election. Sang on the track "Ano Hi No Fuurin" as Waiting Girls. |
| 11 | 2012 | 28 | "Uza" | B-side, New Team B | Did not participate on title track. Sang on the track "Tsugi No Season" as Undergirls, and on "Seigi No Mikata Janai Hero" as New Team B. |
| 12 | 2012 | 29 | "Eien Pressure" | B-side, OKL48 | Did not participate on title track; lineup was determined by rock-paper-scissors tournament. Sang on "Watashitachi No Reason"; and on "Eien Yori Tsuzuku Yōu Ni" as part of OKL48. |
| 13 | 2013 | 30 | "So Long!" | B-side | Did not participate on title track. Sang on the track "Waiting Room" as Undergirls, and on "Sokode Inu no Unchi Funjau Kane?" as Team B. |
| 14 | 2013 | 31 | "Sayonara Crawl" | A-side | Also sang on "Romance Kenjuu" as Team B. |
| 15 | 2013 | 33 | "Heart Electric" | B-side, Center | Did not participate on title track. Sang on the track "Kaisoku To Doutai Shiryoku" as the center of Undergirls, a duo center with Suda Akari. |
| 16 | 2013 | 34 | "Suzukake no Ki no Michi de "Kimi no Hohoemi o Yume ni Miru" to Itte Shimattara Bokutachi no Kankei wa Dō Kawatte Shimau no ka, Bokunari ni Nan-nichi ka Kangaeta Ue de no Yaya Kihazukashii Ketsuron no Yō na Mono" | B-side | Did not participate on title track; lineup was determined by rock-paper-scissors tournament. Sang on the track "Mosh & Dive" as Undergirls, and "Party Is Over" as AKB48 Senbatsu. |
| 17 | 2014 | 35 | "Mae Shika Mukanee" | B-side | Did not participate on title track. Sang on the track "Kino Yori Motto Suki" as Undergirls. |
| 18 | 2014 | 36 | "Labrador Retriever" | A-side | Also sang on "Heart no Dasshutsu Game" as New Team 4. She is now part of Team 4. |
| 19 | 2014 | 37 | "Kokoro no Placard" | B-side | Ranked 32nd in 2014 General Election. Sang on "Dareka ga Nageta Ball" as Undergirls. |
| 20 | 2014 | 38 | "Kiboteki Refrain" | A-Side | Also sang on "Me o Akete Mama no First Kiss" as part of Team 4. |
| 21 | 2015 | 39 | "Green Flash" | B-side | Sang "Haru no Hikari Chikadzuita Natsu" |
| 22 | 2015 | 40 | "Bokutachi wa Tatakawanai" | A-side | - |
| 23 | 2015 | 41 | "Halloween Night" | B-side | Did not participate on title track. Ranked 28th in 2015 General Election. |
| 24 | 2015 | 42 | "Kuchibiru ni Be My Baby" | A-Side | Also sang on "Madona's Choice" as a part of Renacchi's Senbatsu Sousenkyo and "Kin no Hane wo Motsu Hito yo" as part of Team B. |
| 25 | 2016 | 43 | "Kimi wa Melody" | A-side | Marked as the 10th Anniversary Single. Also sang on "LALALA Message" as Next Generation Senbatsu and "Mazariau Mono" as NogizakaAKB. |
| 26 | 2016 | 44 | "Tsubasa wa Iranai" | A-side | Sang on "Koi o Suru to Baka o Miru" as Team B. |
| 27 | 2016 | 45 | "Love Trip / Shiawase wo Wakenasai" | B-side | Also sang "Densetsu no Sakana" as Under Girls and "Black Flower". |
| 28 | 2016 | 46 | "High Tension" | A-side | Sang on "Happy End" as Team B. |
| 29 | 2017 | 47 | "Shoot Sign" | A-side | Sang on "Acccident Chū |
| 30 | 2017 | 48 | "Negaigoto no Mochigusare" | A-side | - |

Question: What year did Rena Kato release "Labrador Retriever," and what role did it have?
Answer: In 2014, Rena Kato's A-side titled "Labrador Retriever" was released.