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: [header] How to relieve constipation after surgery [title] Use a stool softener. [step] One of the first medications to try if you're feeling constipated is a stool softener. These are easy to find over-the-counter and can help get you back on track. <sep> (A) [substeps] The way that stool softeners work is that they draw water into your stool from your intestines. This makes your stool softer and easier to pass. (B) [title] Take 600ml of stool softener before a meal. [step] Most stool softeners kill the production of prostaglandins. (C) [substeps] One good option for relieving constipation at the time of surgery is a stool softener. While stool softeners do provide temporary relief from constipation, they are expensive and will often disappoint you. (D) These medications are named for their antioxidant properties, which help reduce diarrhea and keep your stools from becoming irritated. [substeps] Remember that: the next time you're using an over the counter stool softener treatment, be sure to follow the dosing instructions.
Example Output: A

Example Input: [header] How to sync your fitbit data with your lose it! App [title] Go to lose it! [step] Create a new browser tab and open the lose it! Website at. [title] Sign in. [step] Click the " sign in " button at the top-right corner of the website to go to the login page. <sep> (A) Input your valid username and password and click " log in " to continue. [substeps] You will be asked to provide your gender, birthdate, birthday, and mailing address. (B) Your username and password are now shared with your fitbit account through a special link below your profile picture. Click " sign in " to create a new password. (C) Enter your email address and password to log in. [substeps] You can find the email address and password required here: https: // www.fitbit.com /. (D) Enter your lose it! Account credentials on the text areas provided and tap the " sign in " button to log in. [substeps] If you don't have a lose it! Account yet, click the " create one now " link to get your login details.
Example Output: D

Example Input: [header] How to reduce unnecessary antibiotic use [title] Be more patient with your illness. [step] As a patient, it can be hard to have an illness that's causing uncomfortable symptoms and lots of distress; however, many respiratory and intestinal infections clear up within a few weeks and are not life threatening. As such, take the time to assess your symptoms before visiting the doctor. <sep> (A) This can help avoid unnecessary antibiotic use. [substeps] The rule of thumb is to allow symptoms like mild fever, congestion, running nose and/or cough to run their course, usually about seven to 10 days. (B) That way, and possibly minimize all complications. [title] Be proactive about completing your medical check-ups. (C) [substeps] For instance, your doctor may ask for certain vaccinations and vaccines. You may want to call your healthcare provider to confirm the vaccine has been given and how well the bacteria is working. (D) [substeps] Watch for signs of illness that reoccur after you stop taking prescribed medication. Conditions such as repeated inhalation of a foreign substance can result in chest pain.
Example Output:
A