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". 

Example Input: We see a rowing machine in a exercise room. a lady <sep> (A) picks up a machine and lifts it to her shoulder, then drops it. (B) starts putting her feet in the turning machine. (C) sits on the seat and pulls the cord of the rowing machine. (D) pushes a machine.
Example Output: C

Example Input: [header] How to befriend dogs [title] Make sure the dog is friendly. [step] When approaching a strange dog, be particularly aware of its body language. If an owner is present, ask the owner if the dog is friendly. <sep> (A) Make sure the dog wants to be petted. You can easily alienate a dog by approaching one that is nervous or agitated. (B) If a dog seems hesitant to meet you or extends its hand to you, it's the opposite of friendly. [substeps] Avoid approaching a dog by walking near it and stopping so that the dog can see you. (C) Usually, a dog looks friendly when greeting a stranger but when the dog is not, try something more benign. [substeps] Some common signs of friendliness on dogs are legs waving, laughing, and shoulder-shaking. (D) Common signs of friendly behavior are not always direct stares. If a stranger approaches the dog, its body language may indicate a definite dislike.
Example Output: A

Example Input: [header] How to treat alzheimer's disease [title] Develop a treatment plan with your doctor. [step] If you have been diagnosed with alzheimer's disease, your doctor can work with you to develop a treatment plan that works best for you. They may recommend 1 or more medications based on your overall health, the progress of the disease, and the types of symptoms you are experiencing. <sep> (A) [substeps] The doctor may perform a complete physical exam or order lab tests to assess your condition and rule out any other medical issues. Tell your doctor about your health history and about any medications or supplements you are currently taking. (B) [substeps] Your doctor may suggest taking other medications or an over the counter treatment plan. This may also limit or eliminate your symptoms. (C) Check with your medical professional to see which medications are right for you. In some cases, patients may be prescribed aggressive doses of another kind of medication, even if you tell them you are already taking the other kind of medication. (D) [substeps] Your doctor may suggest selective serotonin reuptake inhibitors. These are thought to reduce levels of inflammation and to improve long-term health by suppressing the production of serotonin.
Example Output:
A