Task: Question Answering
Input (English): A teacher asks her students to examine titles of four scientific articles. Which titled article is specifically about a chemical change?  
 (A) How Baking Soda Reacts With Vinegar (B) How Rust Can Be Scraped off of Metal (C) How Metals Respond to Electrical Currents (D) How Elements Can Change Phase When Heated
Output (English): A