Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: Which one should I prefer? Is it worth it? or Does it worth it? Additionally, is the following form (without it) correct? Is it worth? 
Answer: Which one should I prefer? Is it worth it? or Does it worth it? "Is it worth it?" is correct. Additionally, is the following form (without it) correct? Is it worth? No, that's wrong, worth always needs another word, like "worth twenty pounds" or something.

yes