1. Which of the following conditions has an increased prevalence in persons with mental retardation?

1. Which of the following conditions has an increased prevalence in persons with mental retardation? A. Visual impairment B. Speech impediment C. Hearing difficulty D. Cerebral palsy E. All of the above 2. What proportion of persons with severe mental condition have a seizure disorder? A. 5% B. 15% C. 25% D. 33% E. 75% 3. What is the single most common cause of mental retardation? A. Fragile-X syndrome B. Down syndrome C. CNS trauma D. Edward syndrome E. Alcoholism in the mother