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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%
12
flagNorway
0%
0%
0%
100%
11
flagItaly
5%
0%
0%
94%
17
flagSwitzerland
0%
0%
6%
93%
15
flagMalaysia
0%
0%
0%
92%
13
flagAustria
0%
0%
0%
92%
13
flagPakistan
4%
2%
0%
91%
46
flagGermany
5%
2%
0%
90%
107
flagthe United Arab Emirates
0%
0%
10%
90%
10
flagCanada
0%
3%
3%
86%
30
flagthe United Kingdom
5%
3%
5%
85%
114
flagRepublic of Ireland
7%
7%
0%
85%
14
flagthe Philippines
5%
5%
5%
84%
19
flagPoland
7%
5%
4%
81%
12070
flagAustralia
3%
3%
6%
81%
33
flagIndia
6%
5%
4%
80%
145
flagthe United States
4%
2%
12%
77%
291
flagUnknown
5%
5%
15%
75%
20
flagGreece
6%
13%
6%
66%
15
flagNigeria
7%
23%
7%
46%
13

What is the effect of nicotinic acid on human organism?

it is neutral
It is harmful, causes cancer
It is highly toxic, kills in 10 seconds
It is essential for functioning

Why did people from southern Asia commonly suffer from beriberi sickness in late 1800s?

eating toxic sea algae
inbreeding
drinking dirty water
eating mostly white rice

What fruit contains the largest amount of vitamin C?

Rose Hip
Chokeberry
All Citrus (for example lemon)
Blackcurrant

Which saint killed a dragon?

Sebastian
Michael
Tristan
George