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 recognize symptoms of sickle cell disease (scd ) [title] Get tested. [step] Sickle cell disease can be detected with a simple blood test, so if you think you may have the disease, see a doctor to get tested right away. In the united states, all newborns are required to be screened for sickle cell disease. <sep> (A) [substeps] The screening process is lengthy and requires some paperwork so a doctor can make sure they're perfect. In order to receive diagnosis or treatment, the doctor must first perform a screening test. (B) The more advanced the developing disease, the more likely it is that you may have sickle cell disease. It is a serious disease that causes weight gain, and may affect when you are pregnant. (C) The centers for disease control and prevention (cdc) website has more information on the disease than it does on its own. [title] Be aware of your potential risk factors. (D) This is because early treatment is very beneficial to patients. [substeps] It is also possible to do prenatal screening for sickle cell disease by testing fetal tissues that are collected by chorionic villus sampling or amniocentesis.
Example Output: D

Example Input: Young boy talks to camera in front of drum set in a studio. young boy <sep> (A) plays on the drum set, and the cymbals, while intermittently speaking to the camera. (B) starts taking steps standing on a pedal holding a tool an trying to play an instrument. (C) drum set talk to camera and hold a dummy and cymbals. (D) starts unpacking drum set drum set as the camera captures his movements.
Example Output: A

Example Input: [header] How to restore factory settings in microsoft word [title] Choose the run option from the start menu. [step] This displays the run dialog box. [title] In the " open " box, type in " regedit. <sep> (A) [step] Regedit will allow you to restore default default settings after uninstalling filesystem. [substeps] To change the run dialog box type " regedit..." found on the left; your default open program folder is " start ". (B) [step] " click " ok " to restore your current running options, and " reboot " to backup the system. [title] Log in to microsoft word and navigate to the microsoft office tools section for any dependencies that may exist in the background. (C) [step] " click " ok " to start the regedit program. [substeps] If you are using word 2010, select the hkey _ current _ user/software/microsoft/office/14. (D) [step] " when it comes up you will see a file directory named regedit, which contains your records. In that directory you can safely delete your file.
Example Output:
C