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
An infant with cleft lip, palate, polydactly, microcephaly with holoprosencephaly, ectodermal scalp defect is suffering from? 
Select and explain. 
A. Trisomy 21, B. Trisomy 18, C. Trisomy 13, D. Turner syndrome
C: Trisomy 13
Answer: C: Trisomy 13 
Explanation: None