<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A group of researchers conducted various studies on hepatitis C incidence and prevalence. They noticed that there is a high prevalence of hepatitis C in third-world countries, where it has a significant impact on the quality of life of the infected individual. The research group made several attempts to produce a vaccine that prevents hepatitis C infection but all attempts failed. Which of the following would most likely be the reason for the failure to produce a vaccine?? A: Tolerance, B: Antigenic mimicry, C: Antigenic variation, D: Non-DNA genome, E: Polysaccharide envelope,  <response>: This is a question asking about the likely reason why attempts to produce a hepatitis C vaccine have failed. Based on the information provided, hepatitis C has a high prevalence in third-world countries and significantly impacts quality of life, suggesting it is an important disease to control. The choices provide different immunological phenomena that could potentially explain why vaccine development has failed. To answer this, I need to consider which option best explains the inability to produce a successful vaccine against hepatitis C despite multiple attempts.C: Antigenic variation 