I believe it's Vitamin A! hope I helped :)
Actions that increase one's susceptibility to negative health outcomes are impulsive and ill-thought out actions where a person doesn't necessarily think before he or she acts but just does something. This type of behaviors is very detrimental to different positive health-related efforts of people.
The product of 5 and n subtracted from 100
1 Take vitamins
3 Wash his hands
4 Cover his mouth when coughing or sneezing
5 Stay in his room and avoid common areas of the hous