Task: Question Answering
Input (English): A scientist uses a special chemical marker to label some amino acids. He follows the marker until it becomes part of a large molecule in a cell. Which molecule does he find the chemical marker on?  
 (A) a lipid in a membrane (B) an enzyme in a lysosome (C) a polysaccharide in a cell wall (D) a DNA molecule in a mitochondrion
Output (English): B