system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All of the following constitute familial cancer syndrome except -
assistant
The correct answer is  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.