Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: 2010 Topps UFC Trading Card # 20 BJ Penn (Ultimate Fighting Championship) MMA Trading Card
Product feature: 2010 Topps UFC Trading Card # 20 BJ Penn (Ultimate Fighting Championship) MMA Trading Card, Card is in NM-MT Condition or Better, A Single Card is shipped in a Top Load and/or Soft Sleeve, Look of singles from the set, collect all your favorite players, NOTE: Stock Image Used
Product brand: Topps
Target attributes: Sport
Answer: attribute: sport
value: None
source: None