Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to treat polyomavirus in caique parrots [title] Notice if the parrot has a loss of appetite and low energy. [step] One of the symptoms of polyomavirus is that the bird will stop eating and have low energy. It may appear depressed and lethargic. <sep> (A) [substeps] Often, birds will stop eating to lessen their symptoms, but this is not usually the case with polyomavirus. New birds with polyomavirus may experience lethargy or decreased energy, as well. (B) [title] Check if the bird has persistent abdominal weakness or resistance to movement. [step] This may also result in an unwillingness to stand or to close its eyes in order to heal. (C) Take your bird to the vet right away if your parrot suddenly has mood swings. [title] Notice any changes in the bird's mood. (D) It may also have rapid weight loss due to lack of appetite. [substeps] The infected parrot may also vomit or regurgitate its food back up when it does eat.
Student:
D