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
Edwards syndrome is 
Select and explain. 
A. Trisomy 21, B. Trisomy 18, C. Trisomy l3, D. 5P
B: Trisomy 18
Answer: B: Trisomy 18 
Explanation: TRISOMY 18: EDWARDS SYNDROME Characterised by Prominent occiput Mental retardation Micrognathia Sho neck Overlapping fingers Congenital hea defects Renal malformations Limited hip abduction Low set ears (Robbins Basic Pathology,9th edition,pg no. 238)