In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.

Question: Are Thornton and Elk Grove both in Sacramento County? Passage:The highway enters Sacramento County from the south near Thornton, then continues northward through the western edge of Elk Grove that is mostly uninhabited wetlands with the exception of Laguna West. As I-5 approaches the city limits of Sacramento near Freeport, it runs adjacent to the Sacramento River that is on the west. The river then makes an abrupt westward curve after which the highway is flanked by the south Sacramento neighborhoods of Pocket-Greenhaven on the west and Meadowview on the east. The river curves back and meets with I-5 again, closing up the Pocket area. The highway then continues along the west side of Land Park, passing by William Land Park and the Sacramento Zoo. As it reaches the southwest corner of the downtown grid, the highway has a full-service junction with the 50/Business 80 freeway, and also merges with California State Route 99 for a concurrency.

b