Table:
0
A
B
C
D
E
F
1
Manufacturer
Model
Year Built
Vehicle Length
Fuel Type
# in fleet
2
New Flyer
C35LF
2006
35 feet
CNG
2
3
New Flyer
C35LF
2004
35 feet
CNG
10
4
New Flyer
D35lf
2010
35 feet
Diesel
3
5
Gillig
Phantom
1991
35 feet
Diesel
2
6
GMC
New Look
1981
35 feet
Diesel
3

Questions and formulas:
Question: What is the Manufacturer with a Fuel Type that is diesel?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="diesel"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,E2:E6="diesel"),1))
Level: medium