I am currently driving on a learner's permit with a licensed driver as a chaperone. This is my first ticket. I was making a left turn and did not see a pedestrian in my field of vision. As I fully made a turn I finally saw the pedestrian. I applied the brakes, but the pedestrian momentarily stopped and there was an oncoming car on my right side coming at a very high speed. Since the pedestrian stopped and the car was still oncoming at a high speed I released the brakes and drove ahead. Then an officer pulled me over and said that I didn't stop for the pedestrian. The ticket says that I had, "failed to yield right of way to the pedestrian." I tried explaining to the officer, but he just cut in and said that I didn't stop for the pedestrian. Please help. Should I plead not guilty?