Fintoo Senior Frontend Developer interview questions

They are very solve in everything. They provide me assignment with with 20% information. I have mailed 2 3 time to get full information then I am able to work with assignment. After 2 3 day they called me for next round. They don't ask me question about my role and responsibility. They ask me one question. After that the constancy called me that you are rejected. I was thinking that you can't decide with one question.