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 sneeze properly [title] Cover your nose and mouth with a thick tissue. [step] This is the best way to contain your germs. Cold virus, respiratory syncytial virus, and influenza are are passed by droplets in the air. <sep> (A) Protect your nose against these types of viruses by applying tissue to minimize the amount of one to one, thick hair covering your nose, mouth, and eyes. [substeps] You can use tissue as a mask, covering your nose with a white paper towel when you breathe. (B) By removing as much airflow as possible you run the risk of passing the germs along to others, such as the dog. The narrower the opening of your nostrils, the better your contagious immunity is. (C) When spreading these germs, make sure that you wear a thick, cotton, bug-proof, or fabric nose mask. [title] Clean your mouth with a can of spray. (D) Releasing these viruses through sneezing and coughing is the main way these diseases are spread. Practicing respiratory etiquette (covering your mouth and nose, washing your hands, etc.
Output:
D