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Q- A 7-year-old boy has a difficult time at school. He sleeps during most of the classes and doesn't interact with his teachers in class. He is fighting with many of his classmates because of stealing their lunches but he has never started a fight. When teachers tried to contact his family, they found out that his family left a fake address and phone number.
What is the most likely cause of this boy's behavior?
A- Attention-deficit-hyperactive disorder (ADHD)
B- Antisocial personality
C- Child abuse
D- Oppositional defiant disorder (ODD)
E- Mental retardation

Answer and Explanation

An 18-year-old man presents to the office for evaluation of multiple swellings in his neck. On examination, he has multiple large lymph nodes in his neck. Neurological examination reveals poor coordination on walking. Biopsy of lymph node is positive for lymphoma. He is diagnosed with ataxia-telangiectasia.
What is the etiology of this disorder?
A- Defective DNA repair mechanisms
B- Deletion of VHL gene on chromosome 3
C- Mutation in the NF1 gene on chromosome 17
D- Mutation in PKD1 on chromosome 16
E- Mutation in APC gene on chromosome 5

Answer and Explanation
 
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