In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Input: Consider Input: Article: What a great project this is, building your own greenhouse! If you're a gardener, then a greenhouse is necessary no matter where you live. As long as you've got some good plans, it's possible to build a backyard greenhouse within just a few days. It's a great way to impress the neighbors! Metal greenhouses are practical, I agree, but they look ugly. If you build your own backyard greenhouse from wood, you'll end up with a lovely looking Victorian-style greenhouse, which will last very long if you treat it with the correct wood protection. Of course you'll save a lot of money in the process too. How much exactly? It's difficult to say as it depends on how much glass costs where you live. After all, there isn't much wood required, as it's only the actual frame that is wooden. To make sure you save the most money, it's best to take your plans to wherever you plan to buy your materials. That way you won't end up wasting any money on unnecessary materials. To be honest, saving money is not the main reason for building your own greenhouse. It's the fun you'll get from building it and the pleasure you'll get from showing it off to your friends and family that makes the project worth doing. Nothing beats the feeling when someone asks you where you bought something and you turn around and say "Oh, actually, I built it myself!" That feeling is priceless! You'll never feel like that over something you've bought!
Question: According to the author, it is better to build _ .
Options: (A) a metal greenhouse (B) a grass greenhouse (C) a wooden greenhouse (D) a brick greenhouse

Output: C

Input: Consider Input: Article: As we neared the last days of my mom's life, I wanted to understand what she was feeling and seeing. The day before she took her last breath I decided to ask her. First I wanted to make sure she could comprehend what I was saying. I told her I loved her, and she raised her eyebrows in acknowledgment. Then I shared a funny story about a conversation my sister and I had. The corners of her mouth turned up in a smile. I could tell that she was taking in every word. And then I went for it. "Mom, can I ask you a serious question?" She turned her head and opened her eyes fully. I could tell she wanted to grasp every word that came out of my mouth. "Mom, do you see any of our dead relatives in the room? Do you see your dad?" she shook her head. Do you see your mom?" She shook her head again. "Do you see dad?" Her response was quite different this time. She began nodding her head. "Is he here in this room right now?" She nodded. "Can he see me?" She nodded again. Then she tried to communicate with words, but she couldn't get the words out. The next morning she died peacefully.. A few weeks ago, I was wondering why I haven't had many dreams of my mom since she died. That night I had one of the clearest dreams I've had for a long time. Mom was dressed beautifully. She stared at me with a huge smile. Her eyes were bright and full of life. She was happier than I had seen her in years. And she was younger. We didn't exchange any words, but it was clear that she was happy and free. I woke up with joy in my heart.
Question: What was the author's mother like on the last day before her death?
Options: (A) She had no sense of hearing at all. (B) She couldn't move except her eyes. (C) She could still speak in an unclear voice. (D) She could communicate with her body language.

Output: D

Input: Consider Input: Article: A woman wears a face mask to protect her from polluted air in prefix = st1 /Lanzhou,China, in December. A new study showed air pollution might put people more at risk for heart disease than scientists had thought. Kristin Miller, a doctoral student at the UniversityofWashington, said chances of getting the disease were related to not only which city a woman lived in, but also where in the city. The study found that the effects of air pollution were often larger within cities than between cities. The new findings make experts suspect that current pollution limits may be inadequate. Scientists examined rates of heart attack, stroke and other cardiovascular events in women with long-term exposure to air pollution. The study involved women over the age of fifty who had no sign of cardiovascular disease at the start of the research. The study followed the women for as long as nine years to see how they would develop cardiovascular problems. The researchers also examined levels of fine particles (,) in the air in 36 areas across the country. That information came from the Environmental Protection Agency. The extremely small particles came from industrial smoke and traffic, along with things like wood-burning fireplaces in houses. In the study, every ten-microgram increase in the risk of a cardiovascular event. But it was related to a seventy-six percent increase in the risk of death from cardiovascular disease. But just how do particles in the air damage the cardiovascular system? The particles may cause the lungs to swell and release chemicals from the pollutants into the blood. The chemicals then could damage the heart.
Question: The passage mainly talks about _ .
Options: (A) the effects of pollution on women (B) how to protect women from air pollution (C) how air pollution damages a person's heart (D) the relationship between air pollution and heart diseases
Output: D