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 feline acne [title] Look for small, black spots. [step] Typically, these acne lesions are found on a cat's chin. The spots (blackheads or pimples) are small, firm and black. <sep> (A) [substeps] There are also five small, brown spots. These pimple-like areas are usually painful and can become sores from acne. (B) If you stroke him just under the chin, you'll notice that the skin feels gritty. [substeps] While acne is usually found on the chin, your cat may also have acne lesions above his lip. (C) They are also located on the skin behind the ear (in the upper jaw). The red spots, however, are small, dark and superficial. (D) The additional lumps do not appear immediately, but they increase in size with age. Look for any dark spots on the chin, a white raised scar that lines the hairline, and a few small craters that look like bumps or scars.
Student:
B