Question:
Who was the head of state of Slovakia in Sep, 2017?

Context:
 Rudolf Schuster is the head of the state of Slovakia from Jun, 1999 to Jun, 2004. 
 Zuzana Čaputová is the head of the state of Slovakia from Jun, 2019 to Dec, 2022. 
 Ivan Gašparovič is the head of the state of Slovakia from Jun, 2004 to Jun, 2014. 
 Andrej Kiska is the head of the state of Slovakia from Jun, 2014 to Jun, 2019. 
 Michal Kováč is the head of the state of Slovakia from Mar, 1993 to Mar, 1998.

Answer:
Andrej Kiska