Which one of the following pairs is not correctly matched ?

Barbora Spotakova : Javelin throw
Pamela Jelimo : Weightligting
Sanya Richards : Sprint
Yelena Isinbayeva : Pole Vault

The correct answer is B. Pamela Jelimo is a Kenyan middle-distance runner who specializes in the 800 metres. She is the 2008 Olympic champion and 2007 World champion in the event. She is also the current world record holder in the 800 metres.

Barbora Špotáková is a Czech javelin thrower. She is the 2008 Olympic champion, 2012 Olympic silver medalist, 2011 World champion, and 2015 World silver medalist in the event. She is also the current world record holder in the javelin throw.

Sanya Richards-Ross is an American track and field athlete who specializes in the 400 metres. She is the 2004, 2008, and 2012 Olympic champion in the event, and the 2005, 2007, 2009, and 2011 World champion. She is also the current world record holder in the 4 × 400 metres relay.

Yelena Isinbayeva is a Russian pole vaulter. She is the 2004, 2008, and 2012 Olympic champion, and the 2005, 2007, 2009, and 2011 World champion in the event. She is also the current world record holder in the pole vault.

The incorrect pair is Pamela Jelimo and weightlifting. Jelimo is a middle-distance runner, not a weightlifter.