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: Unknown
In sipple syndrome [MEN II ) all are present except: 
Select and explain. 
A. Pheochromocytoma, B. Pituitary hyperplasia, C. Medullary carcinoma thyroid, D. Parathyroid hyperplasia
B: Pituitary hyperplasia
Answer: B: Pituitary hyperplasia 
Explanation: Ans: b (Pituitary hyperplasia) Ref: Robbins, 7th ed,p. 222MEN 2a is characterized by pheochromocytoma, medullary carcinoma thyroid, and Parathyroid hyperplasia SYNDROMES MEN IMEN IIAMEN II BPituitaryParathyroidAdenomaHyperplasiaAdenomaCarcinomaHyperplasia Adrenal thyroidCortical hyperplasiaPheochromocytomaC cell hyperplasiaMedullary carcinomaPheochromocytomaC cell hyperplasiaMedullary carcinomaExtra endocrine changes MucocutaneousGanglioneuromaMarfanoid habitusMutant geneMEN IRETRETHirschsprung disease - loss of function in RET proto-oncogeneMEN IIA - a gain of function in RET proto-oncogene