Which person engages in habit that are most harmful to his or her health

Which of these might cause a conflict because of how a person was raised

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

For several reasons you should only use hospital approved hand lotion two of the reasons are because they cause breakdown of latex gloves and can become contaminated with bacteria if dispensers are refilled what is another reason