challenge: Where is the village of Vintebbio located in relation to Serravalle?
  
  A. North of the centre of Serravalle, on the left side of Sesia river
  B. East of the centre of Serravalle, on the left side of Sesia river
  C. West of the centre of Serravalle, on the right side of Sesia river
  D. South of the centre of Serravalle, on the right side of Sesia river
  Answer: 