You will be given a definition of a task first, then some input of the task.
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".

[header] How to understand medical terminology [title] Obtain and use a medical dictionary. [step] The first part of deciphering a medical term is to know the different components of a term. [substeps] Root: the essential meaning of the word. <sep> (A) The " + ", the meaning of the word, signals the " + ". Genres: use the elements of a term to interpret the terms. (B) It typically refers to terms pertaining to human abilities and skills. They are often categorized identically among scholars, though they may be strongly similar. (C) It stands for " lv (abnormal amount of blood in the blood) " and has five subparts, four of which refer to " abnormal levels of blood. " lv means abnormal levels of blood. (D) Combining form: a root with a vowel attached to it, most commonly the letter o. this vowel is known as the combining vowel because it combines the root with the rest of the term.
Output:
D