A child is seen in a health care clinic, and a diagnosis of varicella (chicken pox) is confirmed . The parent expresses concern for two other children at home and asks the nurse whether the child is infectious to the other children . Which response by the nurse is most appropriate?None
选项：

A:"The infectious period occurs after the lesions begin ."
B:"The infectious period begins with the onset of the rash ."
C:"The infectious period is not known, and it is possible that the children may develop the chicken pox within the next 2 weeks ."
D:"The infectious period begins 1 to 2 days before the onset of the rash and ends about 5 days after the onset of the lesions and crusting of the lesions ."