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 tell the difference between different types of plant fertilizers [title] Use soluble fertilizer when you want to water in the fertilizer. [step] This fertilizer is usually added to the watering can. [substeps] This is best for helping boost growth when its growing season and for frequently fed container plants. <sep> (A) In the summer break, try adding two or three inches of food to fill the watering can-too much fertilizer will kick in when the corn is thirsty, too little will only keep it growing. Plan it out in a bucket or basin for easy irrigation. (B) [title] Use a hose to water a potted plant after planting. [step] Water a cactus when they get too hot for watering. (C) Leaves that don't bond and stink up the water are also large fertilizer that needs to be added to your watering can. [title] Use different types of fertilizer. (D) [title] Use granular fertilizer when you need to supply a concentrated amount of nutrients. [step] A plant may be lacking in a particular nutrient (this will be evident through such things as yellow leaves, , etc.
Example Output: D

Example Input: [header] How to numb a tooth [title] Take an over-the-counter-painkiller. [step] A painkiller like ibuprofen or acetaminophen should be your first step in trying to numb a painful tooth. These painkillers will alleviate the pain from your tooth, and should also decrease any swelling in the infected area. <sep> (A) [substeps] If you are not able to find ibuprofen, you can opt for acetaminophen instead. [title] Freeze food that contains aspirin. (B) [substeps] Ibuprofen can be applied within 30 minutes to up the duration of an over-the-counter painkiller. Follow the manufacturer's instructions and do not take ibuprofen within 30 minutes after it has been applied. (C) [substeps] Make sure you read and follow the dosage on the packaging. Do not eat anything until told to do so by your dentist to ensure you are following the proper dosage. (D) These are all readily available at your local pharmacy. [substeps] If you're treating a toothache in a child younger than 18, do not give him or her aspirin.
Example Output: D

Example Input: [header] How to home treat a toothache or any minor mouth infection [title] Apply first-aid to an injury. [step] Injuries to the jaw can result in the loss or damage of teeth, which may lead to severe toothache. If you or someone you know has experienced an injury such as a fractured or dislocated jaw, you should call 911 or seek medical care immediately. <sep> (A) [substeps] Have someone get your car serviced or checked over. If you notice bone shards sticking out of the bottom of a broken piece of gum or a chipped tooth, call emergency services right away. (B) [substeps] If you have sprained or had a physical trauma such as a broken bone, the first-aid kit you should provide is readily available. If you have children, take them to their nearest doctor or nurse station. (C) Temporarily bandaging the jaw around the top of the head or holding it gently in place with your hands until you get medical care is recommended. Do not attempt to correct the position of the jaw yourself. (D) Treat the injured person using a simple procedure, such as peeling the skin off the area or applying antibiotic ointment. [substeps] Most people can afford to do it themselves, because they can do the task on their own.
Example Output:
C