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 choose a protein supplement [title] Choose whey protein to build muscle. [step] If you're looking for muscle-building protein, whey protein is generally your best option. Whey protein can come in the form of powder or pills and is commonly used when people are trying to build muscle via things like weight training programs. <sep> (A) By doing this, you're gaining more body fat and growing more muscle at the same time. [substeps] Whey protein can be found in half of the packaged foods. (B) Whey protein is also a low-fat protein, rich in red blood cells from bacteria. Although whey protein does not impart healthy fats to the body, whey protein helps build muscle, which you can grow and burn through exercise. (C) [substeps] Look for a whey protein powder or supplement with a high biological value. This measures how well your body can absorb the protein. (D) Whey protein occurs as a food chain, hence the slogan, " protein is fat free ". [substeps] Whey protein is complex and varies from patient to patient.

Ex Output:
C


Ex Input:
[header] How to recognize signs of senile dementia [title] Check for memory loss. [step] Everyone forgets things from time to time. However, dementia sufferers may have difficulty remembering recent events or familiar routes and names. <sep> (A) Symptoms commonly associated with dementia include : [substeps] Memory loss: selective memory of information. More detailed information could be remembered later, but difficulty recall is more likely. (B) [substeps] Everyone's memory is different, and occasional forgetfulness is common among the general population. Family members and close friends typically will be the best judges of changes in behavior from what he or she was like previously. (C) Some people who have dementia make bizarre or strange memories. For example, they may remember that you are going to their house only after they have returned from their vacation. (D) One common symptom of senile dementia is a loss of memory. A person who stutters on words or can't think well may also suffer from memory impairment.

Ex Output:
B


Ex Input:
[header] How to keep a woman's underarms hairfree [title] Use a sharp razor. [step] Dull razors can cause nicks or cuts while shaving, due to the extra pressure you'll have to put on them to be effective. They can drag harder against skin and become irritating. <sep> (A) Razor blades will also dry out the oils from your hair after you rinse it off. [substeps] Avoid adding shaving products to the brush after showering. (B) [substeps] Also remove jewelry that is too tight or otherwise uses too much force on your underarms-they can cut off your skin and cause further acne. [title] Wash your hair immediately after shaving. (C) Use a sharp, fresh, high-quality razor. Disposables with one blade might not be the best option. (D) Some razors have blades meant to glide instead of cut, which makes them best for underarms. [substeps] Avoid shaving on a loc if you have very thick underarms hair.

Ex Output:

C