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 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.

Ex Output:
A

Ex Input:
A bunch of men are inside a green colored gym. They are lobbing a tennis ball back and forth. they <sep> (A) are engaged in a game of tennis. (B) bounce the ball up and down on the trampoline as they go. (C) hit the ball up high into the air. (D) knock balls off the hoops into the spectators.

Ex Output:
A

Ex Input:
[header] How to teach your kitten to be calm and relaxed [title] Pick the right age. [step] Kittens are most easily socialized between the ages of two to seven weeks. This means that the kitten is more likely to accept new animals, peoples, and situations during this age range. <sep> (A) Although most respectable mother cat owners won't separate the kittens from the mother until the age of eight weeks, this falls outside of the proper time frame. This means that it is typically the original owner's job to socialize the kittens while she is still with the litter and her mother. (B) She can only learn to be calm and relaxed by age 10 or less. [substeps] As a kitten ages, it's much more likely that she'll adjust to the new situation, and will notice more aggressive adult behavior, as well as feline behavior. (C) [substeps] At the 7-week mark, the kittens will be much calmer and more relaxed. Kittens tend to interpret the coming day, so it's important that you wait for a schedule that works for you. (D) [title] Introduce the kitten to the litter box. [step] Once you've picked the perfect age for the kittens to begin the association, wait until the kitten gets used to the routine of the litter box.

Ex Output:
A