What colour is the sky at night? b
Still standing ^^^
A mix of all three of the primary colours!
How many frogs are in my pond? Z
It's not a mix of primary colours though!
The reflected light in the sky at night is perceived as something similar as dark charcoal-like in colour.
Do you wear perfume? Name one major brand. c
(there are 6 frogs in your pond, would of been 7 if you weren't so hungry)
Perfume Q still stands.
Unavailable letter can be made more difficult by stating 2 letters that can't be used and even more tricky by limiting the number of words in the answer.