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
All of the following are types of epiphysis, EXCEPT: 
Select and explain. 
A. Traction, B. Atavistic, C. Friction, D. Pressure
C: Friction
Answer: C: Friction 
Explanation: Epiphysis: The end and tips of bones which ossify from secondary centres is known as epiphysis. There are 4 types of epiphysis:Pressure--head of humerous, condyles of tibia, lower end of radius.Traction--humerus tubercles, trachanters of femur, mastoid process.Atavistic--coracoids process of Scapula, Os trigonum.Aberrrant--Head of first metacarpal and base of other metacarpals.