To which of these ethnic groups do you consider you belong?

White
British
Any other white background

Mixed
White and Black Caribbean
White and Black African
White and Asian
Any other Mixed background

Asian or Asian British
Indian
Pakistani
Bangladeshi
Any other Asian background

Black or Black British
Caribbean
African
Any other Black background

Chinese or other ethnic group
Chinese

Any other: Please describe.

Why am I asking? Because I received a survey this morning as I boarded the train. It was asking me about my train journey, my expectations for it, the experience of my commute this morning, and from a long list of multiple options what my preferences would be for future changes (better information, better cleanliness etc etc).

At the end of the survey was the usual age, sex and type of work questions. Then I was asked the question above. I paused.

Should I answer it?