Task: Question Answering
Input (English): Scientists studying migrating birds and homing pigeons have discovered that they navigate by monitoring differences in the intensity and inclination of Earth's magnetic field. Special cells in bird beaks can detect these changes as the birds fly over Earth's surface. Which metal did the scientists find in the cells that birds use as a magnetometer?   
 (A) iron (B) gold (C) mercury (D) aluminum
Output (English): A