instruction:
In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
question:
Jan was worried about cancer. Jan reduced their nicotine dependence. 
Question: Why did Jan do this?
answer:
avoid any illness


question:
Here's a brilliant piece from Roger Cohen , penned right before last week's 9/11 anniversary : Wednesday , September 10 , 2008 NEW YORK : And in the seventh year after the fall , the dust and debris of the towers cleared . And it became plain at last what had been wrought . For the wreckage begat greed ; and it came to pass that while America's young men and women fought , other Americans enriched themselves . 
Question: Why was there a 9/11 anniversary ?
answer:
Because 9/11 was a very significant event in history .


question:
One day I went into my bathroom to take a shower. There was a lot of gunk on the walls and hard water build up around the shower head. I decided it was time to clean the shower before things got worse. I went to my cleaning supply cabinet and took out some cleaning spray, paper towels, and a scrubber. Before I removed any grime from the shower, I took out all of my shampoo, conditioner, and other items from the shower. Whatever was empty or I never used, I tossed out. From there I sprayed down the shower with the cleaning chemicals and let it sit for a while. After that I got in there with the scrubber and scrubbed until there was nothing left on the tiles. On the more delicate things, I used the paper towels to wipe down. Once all was clean, I used the removable shower head to rinse down the shower walls and tub. Once clean, I returned the remaining shampoo bottles, etc. and put away my cleaning supplies. 
Question: What kind of brush did they use to clean the shower walls?
answer:

Scrub brush