Detailed Instructions: In this task, you're given an article, a question which often contains a blank, four options (associated with "A", "B", "C", "D") and the answer to that question. Your task is to classify whether the given answer is correct or not by providing "Yes" or "No", based on the article.
Q: Article: Nathan's second-hand bike was good enough to get him anywhere he wanted to go. Of course, it couldn't match Tim's in a normal speed race, but all the fancy gears in the world wouldn't get you up Black Mountain. It was so steep in places that you had to get off your bike and push. On this particular afternoon, the odds were all on Nathan's side. First, he was stronger. Tim had always been thin, but recently he'd started to grow so fast that his arms and legs were like pieces of spaghetti. As well as being considerably fitter than his friend, Nathan knew the shortcuts up prefix = st1 /BlackMountain. So when Nathan accepted the challenge, he was sure he'd win. He nearly always did, in competitions with Tim. That was what was strange. Tim was so competitive, and yet he wasn't any good at physical things. By the time the two boys were three quarters of the way to the top, Nathan was clearly ahead. While the road zigzagged back and forth up the mountainside, in certain places, there were also vertical tracks, where water rushing down the slope in winter had bitten erosion courses into the soil. These had in turn been so overgrown by bushes and long grass in the spring that they looked like tunnels through the bush. The trick was to know where you could cut off a whole bend in the road by leaving the road and pushing your bike up one of these half-hidden pathways. If you chose the wrong one you'd struggle up for ten minutes and then suddenly reach a dead end. Then there was no choice but to go back.
Question: What did Tim challenge Nathan to do?
Options: (A) test who had the fastest bike (B) decide who was the most competitive (C) find the secret tracks on the mountain (D) race to the top of BlackMountain
Asnwer: C
A:
No