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 Q]: [header] How to clean a vornado fan [title] Clean out dust in the outer grills using a vacuum cleaner brush. [step] You can use a brush attachment on a vacuum cleaner to clean out all of the dust from the outer grills. Make sure the fan is unplugged before vacuuming. <sep> (A) [title] Place a cleaning rod in each section of the fan and squirt some cleaning fluid through each rod. [step] Avoid getting any grease in the vents or rest tray. (B) Some of the cleaner should be removed from the outside if you use a cloth and brush as cleaning instructions are laid out in the manual. [substeps] Avoid cleaning the outer grills with dust because it can detach some of the insulation and contribute to the fan's cooling. (C) Wipe down the inside of the cover every few minutes so you can put the fan back together. [substeps] For maximum efficiency, you should wash your vornado fan at least once a month, which is right after each dry run. (D) Go slowly when vacuuming to ensure you clean out as much dust as possible. [substeps] This will only clean the outer part of the fan, not the inside blades.
[EX A]: D

[EX Q]: [header] How to perform an autopsy on a human being [title] Understand what an autopsy is. [step] An autopsy is a detailed examination (and dissection) of a human body after death. It is used to determine the likely time and cause of death, as well as to evaluate the presence of disease and/or injuries. <sep> (A) An autopsy is often performed during the day after a death, or at night. Depending on your body type, an autopsy can last longer or shorter if done with the right equipment. (B) The autopsy is often conducted as a procedure administered in an office, rather than a surgical procedure, but it is treated in multiple ways. [substeps] For a crime scene autopsy, the job is to put the human body's dna on a piece of paper and then render it to a laboratory for analysis. (C) [substeps] An autopsy is conducted by a pathologist, which is a doctor with specialty level training in how to do the procedure and how to effectively analyze the tissues and body fluids. If the person's death is being investigated forensically, an autopsy may be legally mandated. (D) A typical autopsy takes place approximately 50 minutes after the death of the patient. The procedure consists of the following components : [substeps] Removing the deceased's organs from the body.
[EX A]: C

[EX Q]: [header] How to get rid of dreadlocks [title] Cut off each dreadlock with scissors. [step] How short you cut the dreadlocks depends on how much hair you wish to retain. Perform this step even if you plan to shave your head, it will make the process a lot easier. <sep> (A) [title] Gather hair from your dreadlocks all over your head. [step] Do this up to the scalp, as these dreadlocks are usually a shade darker. (B) [substeps] Keep the amount of cutting off to a minimum. One short dreadlock is enough to cover the entire head without cutting off too much hair. (C) [substeps] If you plan to shave your head, cut the dreads off close to the scalp where the hair is less tangled. If you want to retain a bit of length without too much work, cut off lock 1-2 " from the scalp. (D) Trim as much to the desired length as possible using barber scissors as they are too sharp for the most regulation. [title] Wash your head before getting the dreadlocks done.
[EX A]:
C