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: Pediatrics
A  child has been brought to OPD with mental retardation. On examination, microcephaly, triangular face, fifth finger clinodactyly is found. What is the most probable diagnosis 
Select and explain. 
A. Russel Silver Syndrome, B. Angelman Syndrome, C. Treacher Collin Syndrome, D. Pierre - Robin Syndrome
A: Russel Silver Syndrome
Answer: A: Russel Silver Syndrome 
Explanation: Features of Russel Silver Syndrome

Triangular face
Microcephaly
Short stature
Low birth weight
Fifth finger clinodactyly.