Statement made by persons to the Commission

No statement made by a person in the course of giving evidence before the Commission shall subject him to, or be used against him in, any civil or criminal proceeding except a prosecution for giving false evidence by such statement:

Provided that the statement-

1. (k) is made in reply to a question which he is required by the Commission to answer, or
2. (l) is relevant to the subject matter of the inquiry.