Which is the wrong description of see a doctor in the UK？

Which is the wrong description of see a doctor in the UK？
A.International students have to pay for healthcare services if they stay for over 6 months.
B.Tourists can have free healthcare services if they stay for over 6 months.
C.For the British， heathcare services are totally free.
D.Normally， seeing a doctor requires appointment.
正确答案：For the British， heathcare services are totally free.