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: Anatomy
Platycephaly is: 
Select and explain. 
A. Premature closure of unilateral occipitoparietal suture, B. Premature closure of bilateral coronal suture, C. Flat skull, D. Premature closure of unilateral coronal suture
A: Premature closure of unilateral occipitoparietal suture
Answer: A: Premature closure of unilateral occipitoparietal suture 
Explanation: None