Which fermentation method isn't used in beer brewing?

warm
cool
side
spontaneous
There are three main fermentation methods, warm, cool and wild or spontaneous. Fermentation may take place in open or closed vessels. There may be a secondary fermentation which can take place in the brewery, in the cask or in the bottle.
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Answers by country

warm
cool
side
spontaneous
answers
flagAustria
3%
12%
57%
27%
33
flagthe United States
5%
5%
50%
34%
73
flagAustralia
8%
8%
50%
33%
12
flagPoland
6%
8%
49%
35%
5394
flagGermany
7%
6%
47%
36%
249
flagSwitzerland
3%
17%
42%
32%
28
flagthe United Kingdom
15%
13%
39%
31%
38
flagGreece
12%
12%
37%
37%
16
flagRepublic of Ireland
7%
23%
30%
38%
13
flagIndia
20%
20%
29%
29%
24