TASK DEFINITION: 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". 
PROBLEM: [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.

SOLUTION: D

PROBLEM: [header] How to style hair with hot rollers [title] Get the rollers ready. [step] Go ahead and plug in the hot rollers so that they're fully heated by the time you're ready to put them in your hair. If this is your first time using your set of rollers, read the manufacturer's instructions to make sure you use the equipment properly. <sep> (A) [title] Spray your hair with gentle hold hairspray. [step] Start with dry hair, since your hair won't hold curls if you use this method with wet hair. (B) [substeps] Always hold the handle of the steam wand between your wrist and the rollers. Never hold the handle of a curling iron at a normal straight line. (C) [substeps] Make sure your hair is fully washed and dry to avoid taking off any primer or styling gel. [title] Brush your hair while in the rollers. (D) [substeps] For thicker hair, use an extension. If your hair is thick, use an extension with one end attached to the round back of your hair.

SOLUTION: A

PROBLEM: [header] How to cut bok choy [title] Select fresh bunches of bok choy. [step] Look for heads with bright green leaves and crisp white stalks without holes or discoloration. [substeps] Bok choy, also known as pak choi, can be found in a number of varieties that offer different flavors, sizes and colors. <sep> (A) Some bok choi have larger heads, but their leaves tend to be the same color. For freshers that prefer finer bok choi, this may be the best option. (B) Bok choi also be very hardy, and it has a shorter flowering period compared to its other plant types. [title] Cut the bok choi with a knife or small pole about 1/8th of an inch (0.6-0.91 cm) above the plant's surface. (C) Varieties with larger leaves tend to work well for salads and soups, while the smaller, narrower heads work well for stir-fries. [title] Trim and discard the thick base of the bok choy. (D) If you have any questions, contact a knowledgeable farmer or horticulture expert. [title] Choose and slice the bok choi to accommodate a variety of tastes.

SOLUTION:
C