(1) A single expert witness must answer a question received under rule 7.26 within 21 days after the later of the following:
(a) the date the expert witness received the question;
(b) the date the fees and expenses for answering the question are paid or secured.
(2) An answer to a question:
(a) must be in writing; and
(b) must specifically refer to the question; and
(c) must:
(i) answer the substance of the question; or
(ii) object to answering the question.
(3) If the single expert witness objects to answering a question or is unable to answer a question, the single expert witness must state the reason for the objection or inability in the document containing the answers.
(4) The single expert witness's answers:
(a) must be:
(i) attached to the affidavit under subrule 7.21(2); and
(ii) sent by the single expert witness to all parties at the same time; and
(iii) filed by the party asking the questions; and
(b) are taken to be part of the expert's report.