You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to avoid getting chicken pox while helping an infected person [title] Understand how the chickenpox virus spreads. [step] The virus is highly contagious and spreads in the air through airborne particles that come from the lesions on the skin or from the upper respiratory tract. You can also contract the virus from contact with open lesions when you touch your face, nose, or mouth. <sep> (A) While it is not contagious, the virus can spread if irritated by a scratch. [substeps] Eczema, for example, can occur due to jock itch or ingrown toenails. (B) [substeps] The disease takes 10 to 21 days after exposure to develop. From studies of transmission across household members, approximately 90% of people with close contact with infected individuals will develop the disease. (C) If you find yourself feeling ill while helping a patient, and the contagious virus is spreading to your body, or on them, contact the doctor right away. [substeps] The virus will spread through the individuals who touch their faces and mouths. (D) This bacteria is not a endemic virus and everyone may get it from someone else. [substeps] Let your doctor know that you are not sure about the hepatitis b virus.
Output:
B