Question to the selected user can only reply by this user rule. How?

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preper's picture

I want to found a ask to the expert system. There are many experts and they have profile pages. User can select the expert and go to the experts profile page. There will be a link or a form in the expert's profile page and this will be a node type for this expert.

For example: To ask a question to doctor1 user will select his profile, in his profile there will be a link or form 'ask to doctor1' and this will create a node which content type is doctor1. My idea is to make comments as answers and only doctor1 can be able to comment to this node type.

How should I do that by ruling?

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