Question:
Who was the head coach of the team Aris Thessaloniki F.C. in May, 2016?

Context:
 Paco Herrera is the head coach of Aris Thessaloniki F.C. from Jan, 2018 to Nov, 2018. 
 Michael Oenning is the head coach of Aris Thessaloniki F.C. from Oct, 2019 to Sep, 2020. 
 Apostolos Mantzios is the head coach of Aris Thessaloniki F.C. from Sep, 2020 to Feb, 2022. 
 Nikos Anastopoulos is the head coach of Aris Thessaloniki F.C. from Jan, 2015 to Jan, 2017. 
 Germán Burgos is the head coach of Aris Thessaloniki F.C. from Feb, 2022 to Aug, 2022. 
 Alan Pardew is the head coach of Aris Thessaloniki F.C. from Sep, 2022 to Dec, 2022. 
 Savvas Pantelidis is the head coach of Aris Thessaloniki F.C. from Nov, 2018 to Sep, 2019.

Answer:
Nikos Anastopoulos