Which of the following statements is false regarding sunlight exposure and vitamin D production?
1) In the continental US, summertime exposure to sunlight can produce the majority of the body's requirement for vitamin D
2) One glass of fortified milk has an equivalent amount of vitamin D to what is produced after 10 minutes of sun exposure in the summertime in a healthy, young individual
3) Use of sunscreen can block the majority of sun-induced vitamin D production
4) A person with a darker skin tone produces less vitamin D from sun exposure than a person with a lighter skin tone