Question: What boxing title did Walter Matthysse's brother hold from 2012 to 2013?

Related documents: [0]  [DOC] Lucas Martin Matthysse (born September 27, 1982) is an Argentine professional boxer. He held the WBC interim super lightweight title from 2012 to 2013, and has challenged twice for a world title in 2013 and 2015. Matthysse is known for his aggressive pressure fighting style and formidable punching power. His older brother is former professional boxer Walter Matthysse. [END] 
[1]  [DOC] Walter Dario Matthysse (born August 29, 1978) is an Argentine former professional boxer who competed from 2002 to 2009, and challenged once for the IBF welterweight title in 2007. He is the elder brother of professional boxer Lucas Matthysse. [END]  
Answer: WBC interim super lightweight title
WBC interim super lightweight title