question: what was the result of kaltouma nadjina finished in fifth place with a time of?
table.cells: athlete event heat quarterfinal semifinal final
table.cells: result rank result rank result rank result rank
table.cells: djikoloum mobele 100 m dns did not advance
table.cells: kaltouma nadjina 400 m 51.50 3 q n/a 51.57 5 did not advance