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". 

Ex Input:
[header] How to live with both ibs and gerd [title] Know and avoid your trigger foods. [step] Although completely separate conditions, both ibs and gerd come with a set of trigger foods. These may vary from person to person, but it's essential that you're aware of your trigger foods and you avoid them. <sep> (A) [substeps] Many people have food allergies and triggers that negatively impact quality of life. If one of your triggers is food, check out their menu to work up a few good options with little or no calories. (B) Binging on these foods may trigger your mood, lower your risk of paranoia and depression, and reduce your symptoms. Common trigger foods include : [substeps] Chicocortisone and aspirin (e.g. (C) [substeps] If you're not fully sure what foods set off your symptoms, start a food/symptom journal. Write down everything you eat, the symptoms that follow and the severity of the symptoms. (D) The second the disorder begins to manifest on you, know the entire progression so you'll be able to identify triggers more easily. [substeps] Trigger foods are foods such as ice cream, energy drinks, chocolates, candy, pop, and more.

Ex Output:
C


Ex Input:
[header] How to ask customers for feedback [title] Use a survey. [step] Surveys are the easiest method for collecting feedback. You can create a survey on surveymonkey and then send an email to your clients. <sep> (A) You can also post a link to the survey on your twitter and facebook pages. [substeps] Consider posting short surveys on your website using qualaroo or an equivalent tool. (B) This gives you a much-needed opening to discuss your feedback. [substeps] Write a survey that states how well the company is doing. (C) Keep in mind that you are going to be giving customers feedback about your company. The survey can be in the form of a written question or business letter, a presentation or post, or forum. (D) Be sure to include your real name so that the survey can be retrieved and someone else can reach out to you if needed. Customers then will be able to find you and send you back their feedback.

Ex Output:
A


Ex Input:
[header] How to stop erosion on a river bank [title] Use coir netting that's 700-900 grams per square meter (gsm). [step] Coir netting is made from coconut fibers and is biodegradable. Normal or heavy duty netting should be used when there is a large amount of water flow. <sep> (A) If you observe any decline in the water there is not much you can do to prevent erosion. [substeps] For bigger rivers (e.g. (B) [substeps] Coir netting can be purchased online or from specialty landscaping and yardwork stores. Depending on the climate conditions in your area, coir netting can last from 24 to 48 months. (C) If the water flow is moderate (0 %), bring the netting to a local bank. [substeps] The netting holds water in, preventing it from coming out. (D) Find coir netting at a local hardware store or online. [title] Mix a strong capful of regular super dish dish soap into the water and you're ready to work.

Ex Output:

B