This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
All of the following constitute familial cancer syndrome except - 
Select and explain. 
A. Xeroderma-pigmentosum, B. Retinoblastoma, C. Neurofibromatosis, D. MEN-I
A: Xeroderma-pigmentosum
Answer: A: Xeroderma-pigmentosum 
Explanation: All are familial cancer syndromes.
Xeroderma-pigmentosa is autosomal recessive, defective DNA repair syndrome.
Other three are autosomal dominant inherited cancer syndrome.
Amongst the given options best answer is a i.e. xeroderma pigmentosa because autosomal dominant inherited cancer syndromes are the most common type of genetically predisposed cancer.