Task: Question Answering
Input (English): Background Paragraph: A person with a serious brain injury usually suffers permanent brain damage. These brain injuries usually occur when an external mechanical force, such as a violent blow or jolt to the head or body, causes brain dysfunction. An object penetrating the skull, such as a bullet or a shattered piece of the skull, also can cause traumatic brain injury. As a result, the person may have trouble talking or controlling body movements. Symptoms depend on what part of the brain was injured. Serious brain injuries can also cause personality changes and problems with mental abilities such as memory. Medicines, counseling, and other treatments may help people with serious brain injuries recover from, or at least learn to cope with, their disabilities. 
Story: Jill and Bob are working on a construction site together when suddenly two wooden planks fall from three stories up. One plank hits Bob on the head and the other lands directly on Jill's shoulder. Everyone rushes over to them to check if they are ok. All the people are relieved that Bob and Jill appear to be alright, but they urge them both to go visit a doctor to get checked out. 
Question: Which person is more likely to have trouble talking?
Output (English): Bob.