Can cyclists remove their helmet on interurban roads?

Can cyclists remove their helmet on interurban roads?
A)No.
B)Only on prolonged uphill slopes.
C)In the case of prolonged uphill slopes, in extreme heat conditions, or for medical reasons.Correct
Bicycle riders and, where applicable, their passengers, are required to wear an approved protective helmet when riding on interurban roads, except on prolonged uphill slopes, for justified medical reasons, or in extreme heat conditions.