On 11 August, Barcelona started the 2015–16 season winning a joint record fifth European Super Cup by beating Sevilla FC 5–4 in the 2015 UEFA Super Cup. They ended the year with a 3–0 win over Argentine club River Plate in the 2015 FIFA Club World Cup Final on 20 December to win the trophy for a record third time, with Suárez, Messi and Iniesta the top three players of the tournament. The FIFA Club World Cup was Barcelona's 20th international title, a record only matched by Egyptian club Al Ahly SC. By scoring 180 goals in 2015 in all competitions, Barcelona set the record for most goals scored in a calendar year, breaking Real Madrid's record of 178 goals scored in 2014.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who did Barcelona beat to win the 2015 UEFA Super Cup?
Ah, so.. Sevilla FC

The earliest mentions of Slavic raids across the lower River Danube may be dated to the first half of the 6th century, yet no archaeological evidence of a Slavic settlement in the Balkans could be securely dated before c. 600 AD.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who raided the Slavics?
Ah, so.. unanswerable

Additionally, there are a number of Assistant Chiefs of Defence Staff, including the Assistant Chief of the Defence Staff (Reserves and Cadets) and the Defence Services Secretary in the Royal Household of the Sovereign of the United Kingdom, who is also the Assistant Chief of Defence Staff (Personnel).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What assistant in the royal household is also responsible for Reserves and Cadets?
Ah, so..
unanswerable