What is the answer of "If I reject you in this interview then what will you do"?

If you don't recruit me I will get selected for company B. Company B has selected 30 students for interview and are going to select 15. Let me tell you that most of the students that were shortlisted by your company are in the shortlist for other company as well.

I was asked the same question during campus placement..

Background: We had 2 companies scheduled on that day (let us call them A and B). A in morning and B in the evening.
The company A had 25 students shortlisted for interview and B 30 students.

Company A was very selective and known to recruit only 2-3 students every year and once you are rejected you can not apply for this company for next 2 years. Company B was also selective but was on expansion phase and announced in their ppt that they will recruit 15 students this time.

I cleared first 2 rounds of Company A and was in the final interview with 3 other students..

Interviewer asked me "What will you do if we don't recruit you."

I replied " If you don't recruit me I will get selected for company B. Company B has selected 30 students for interview and are going to select 15. Let me tell you that most of the students that were shortlisted by your company are in the shortlist for other company as well. Since I am sitting in the final round this means I am better that remaining 21 of them.
But make a note for today's date. Exactly two years from now I will again be applying for your company for the job that I can assure you."