law: 42. Statement made before Commissioner.
  No statement made by a person in the course of giving evidence in an inquiry before the Commissioner shall subject him to, or be used against him, in any civil or criminal proceeding, except in a prosecution for giving false evidence by such person:
  Provided that the statement is
  (a) made in reply to a question which is required by the Commissioner to answer; or
  (b) relevant to the subject matter of the inquiry.