Table:
0
A
B
C
D
E
1
Country
Builder
Location
Ship
Class / type
2
United Kingdom
Samuda Brothers
Poplar, London
Orion
Belleisle-class ironclad
3
United Kingdom
John Elder and Co
Govan , Scotland
Arizona
Passenger ship
4
Germany
Schichauwerft
Danzig
Gneisenau
Three masted full rigged ship
5
United Kingdom
Chatham Dockyard
Chatham, Kent
Agamemnon
Ajax-class ironclad
6
United Kingdom
Sheerness Dockyard
Sheerness
Kingfisher
Sloop

Questions and formulas:
Question: What is Country, when Class / Type is "Three masted full rigged ship"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="three masted full rigged ship"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="three masted full rigged ship"),1))
Level: medium
Question: What is Builder, when Country is "United Kingdom", and when Location is "Chatham, Kent"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(A1="united kingdom")*(C1="chatham, kent")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(A2:A6="united kingdom")*(C2:C6="chatham, kent")),2))
Level: medium
Question: What is Builder, when Ship is "Arizona"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="arizona"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="arizona"),2))
Level: medium
Question: What is Location, when Class / Type is "Sloop"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="sloop"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="sloop"),3))
Level: medium
Question: What is Country, when Builder is "Sheerness Dockyard"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="sheerness dockyard"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,B2:B6="sheerness dockyard"),1))
Level: medium
Question: What is Builder, when Location is "Govan , Scotland"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="govan , scotland"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6="govan , scotland"),2))
Level: medium