Which prefix means 'negative, none'?

• A. A-
• B. An-
• C. Endo-
• D. Caud/o

Answer: (A)

The idea here is using a privative prefix to show absence or lack. The basic negation prefix is a-, which means without or none. It attaches to a root to convey that the condition or quality is missing. Before consonants, you’ll see a- (as in amoral, asymptomatic); before vowels, the form becomes an- (as in anemia, anesthesia). Both carry the same meaning of negation, but a- is the standard form, with an- simply a phonetic variant for easier pronunciation when the following sound is a vowel. Since the question asks for the prefix meaning negative or none, the straightforward form to recognize is a-. Endo- means inside, and caud/o refers to the tail, neither of which express negation.