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
According to Hoyme et al classification of hemihyperplasia, Hemifacial hyperplasia involves: 
Select and explain. 
A. Half the body, B. Single limb, C. One side of face, D. None
C: One side of face
Answer: C: One side of face 
Explanation: Hoyme et al (1998) provided an anatomic classification of hemihyperplasia: 

Complex hemihyperplasia is the involvement of half of the body (at least one arm and one leg); affected parts may be contralateral or ipsilateral.
Simple hemihyperplasia is the involvement of a single limb.
Hemifacial hyperplasia is the involvement of one side of the face.

Ref: Shafer's textbook of oral pathology 7th edition page 14