By how much can wearing a helmet when riding a bicycle reduce the risk of head injury?

a.
85 percent

b.
10 percent

c.
15 percent

d.
40 percent

Wearing a helmet when riding a bicycle can reduce 85% the risk of a head injury. So the answer is A.

what are the choices?

that information cannot be released except with patient permission or to immediate family members. you could state the patient is ok but you cannot give any information on the illness or on treatment being given.