This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
[{'content': 'Mastoid is which type of epiphysis- \nSelect and explain. \nA. Traction epiphysis, B. Atavistic epiphysis, C. Aberrant epiphysis, D. Pressure epiphysis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Traction epiphysis Types of epiphysisExamplesPressureHead of femur, head of humerus, condyles of tibia, lower end of radiusTractionGreater and lesser trochanters of femur, tubercles of humerus, mastoid processAtavisticCoracoid process of scapula, posterior tubercle of talus (as trigonum)AberrantHead of 1st metacarpal and base of other metacarpals.", 'role': 'assistant'}]