Given the task definition and input, reply with output. Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.

Paragraph: The main syndrome of vitamin B deficiency is pernicious anemia . It is characterized by a triad of symptoms :
Question: a severe vitamin b12 deficiency results in what form of anemia


pernicious