Suppose Serena Jackson (born June 25, 1980) is an Australian swimmer who competed in the 2004 Summer Olympics in Athens, Greece. She won a silver medal in the women's 200m freestyle event. She retired from professional swimming in 2006 and now works as a swim coach for young athletes in Melbourne, Australia.
Can we infer that "Serena Jackson won a gold medal in the 2004 Summer Olympics."? Yes, no, or maybe?