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 get rid of ear mites in a cat [title] Look for excess wax. [step] The ear mites provoke the lining of the ear canal to produce excessive amounts of wax. This wax is typically a dark brown/black color, and can sometimes look like waxy dirt in the ear. <sep> (A) Bacteria that builds up in the ear canal may also cause an ear mite! [substeps] When your cat spends time in an owner's home, they may ingest an entire layer of wax. This may produce a distinct odor (which will often become noticeable over time). (B) When wax builds up, it will turn brown, appearing beet-y. [substeps] Wax from glands just above the ear canal comes in dots or streaks. (C) It is often caused by fungal or viral infections (such as herpes bacteria). [substeps] If you find your cat licking the wax, call your vet. (D) [substeps] A cat with healthy ears will have minimal earwax. If you see something that looks like coffee grounds or flecks of black dirt in the ear, this is a sign of a possible ear health problem.
Output:
D