No matter how complex the chains of reactions going on inside a material brain, the eventual outcome will still be a reaction - not a choice.
The words"reaction" and "choice" are two different words with two different meanings.
Yes, a choice is a subset of reactions, all it means is that it is you reacting to the possibility of having more than one course of action available to you.
To enable choice, you need a deliberate interaction - not a reaction, to invoke the choice. Without this interaction there is no choice.
A deliberate interaction is just a series of reactions that involve the process of deliberation. You're just playing silly word games.
There is also the problem of being able to reach valid conclusions within a brain totally driven by physically defined chains of reactions with no means of conscious intervention. I know I have breached this subject before, but never had any viable explanation.
Of course you have, you've just ignored them all in favour of mindlessly repeating the same drivel as if nobody had replied at all. For about the ten thousandth time: for a start, you've have never once managed to actually express how you think the impossible, nonsensical, self-contradictory, unimaginable ability to have chosen differently without randomness, would help with the validity of any conclusion you might reach.
The claim of "no means of conscious intervention", is just a misrepresentation of what is being said; the involvement of consciousness has nothing to do with it being a chain of reactions, neither does whether the reactions are entirely physical or not. Regardless of both, your mind is either operating as a
deterministic system or it isn't, and therefore, by definition, there must be some randomness involved.
Do we really have to go through this all over again, or have you actually thought of any new answers to the logic you've been studiously ignoring?