I had quite a few things on my application that suggested that I originally planned to apply MD/PhD, but later decided to apply MD-only.
In my experience, I was asked about my decision to not apply MD/PhD a few times, typically by interviewers who were themselves MD/PhDs. Just make sure you are prepared to explain your reasoning for applying MD-only when it comes up out on the interview trail. This gives you a valuable opportunity to better explain your career goals to the committee, and that's never a bad thing if you are prepared and well-composed in your response.