Which vitamin is produced in the skin during sun bathing?

vitamin A
vitamin B
vitamin C
vitamin D
Vitamin D is synthesized from cholesterol in the skin with the help of the natural ultraviolet wavelength of sunlight. Supplementation of vitamin D is recommended only for sun-deprived people (eg. elderly or living in the Far North).
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Answers by country

vitamin A
vitamin B
vitamin C
vitamin D
answers
flagthe Netherlands
0%
0%
0%
100%
19
flagNorway
0%
0%
0%
100%
11
flagAustria
0%
0%
0%
95%
22
flagPakistan
4%
2%
0%
91%
49
flagSwitzerland
0%
0%
8%
91%
23
flagGermany
4%
3%
1%
90%
215
flagAustralia
2%
2%
4%
87%
47
flagMalaysia
6%
0%
0%
86%
15
flagItaly
9%
0%
4%
85%
21
flagRepublic of Ireland
10%
5%
0%
85%
20
flagthe United Kingdom
6%
2%
5%
84%
158
flagPoland
7%
5%
4%
82%
13134
flagIndia
6%
4%
4%
81%
174
flagCanada
2%
2%
8%
80%
36
flagthe United States
4%
2%
13%
76%
336
flagthe Philippines
7%
3%
7%
76%
26
flagGreece
4%
9%
4%
76%
21
flagUnknown
5%
5%
15%
75%
20
flagSouth Africa
9%
0%
18%
63%
11
flagNigeria
7%
23%
7%
46%
13