This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Patau syndrome due to 
Select and explain. 
A. Trisomy 21, B. Trisomy 18, C. 18 P, D. Trisomy l3
D: Trisomy l3
Answer: D: Trisomy l3 
Explanation: <p>PATAU SYNDROME:- Trisomy 13 47 XX Characteristic features:- 1. Microcephaly and mental retardation. 2. Microphthalmia 3. Cleft lip and palate. 4. Cardiac and renal defects 5. Umbilical hernia 6. Rocker bottom feet {Reference:Robbins basic pathology 9E pg no.248}</p>