This question has not been systematically tested. Therefore, only the spontaneous comments of some test persons are available - if at all.
Russian
Test person RUS02 asks spontaneously if she can select two languages here.
English
Subject ENG01 indicates two native languages, English (as official language) and Ibo as native language. At first, he is surprised that Youroba and Hausa are available as languages, but not Ibo.
When he thinks about the fact that the questionnaire is distributed to people from many countries, he puts his opinion into perspective, as the other languages are larger or are also spoken in countries other than Nigeria.