Please answer the question according to the context and answer candidates . Each answer candidate is associated with a confidence score within a bracket. The true answer may not be included in the candidates.

Context: Inflated kites in various shapes float in the air.
Question: What chemical makes cats fly?
Candidates: air (0.69), helium (0.62), oxygen (0.04)
Answer: helium

Context: The man is smiling at a birthday cake.
Question: What is he about to blow out?
Candidates: candle (0.99), birthday (0.02), fire (0.01)
Answer: candle

Context: a group of children stand around a cake.
Question: What fills the balloons?
Candidates: air (0.28), helium (0.07), wine (0.03)
Answer:  The letter p should appear at least 18 times.
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