Given the question: "can apple be eaten" and the candidate answer: "{yes}",
Utilizing your own reasoning ability, assess the probability that the candidate answer is the true answer.
Please provide a number between 0 and 1 as the output, following the guidelines below:
If the probability is between 0 and 0.3, it signifies that the model has substantial evidence to suggest it is an incorrect answer.
If the probability is between 0.3 and 0.5, it suggests that the model leans towards considering it an incorrect answer, but lacks concrete evidence.
If the probability is between 0.5 and 0.7, it indicates that the model leans towards considering it a correct answer, but lacks concrete evidence.
If the probability is greater than 0.7, it signifies that the model has substantial evidence to suggest it is the correct answer.
If the candidate answer doesn't provide clear solution to the question, the probability should be 0. 
Your output is a number with no extra string.
The score is: Do not say the word "probability" in the response
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