This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
Colonic pseudo-obstruction occurs in all, except: 
Select and explain. 
A. Diabetes mellitus, B. Dermatomyositis, C. Scleroderma, D. Hyperthyroidism
D: Hyperthyroidism
Answer: D: Hyperthyroidism 
Explanation: Ans. (d) HyperthyroidismCauses of secondary pseudo-obstruction of colon: (Secondary pseudo-obstruction of colon is most common)* Neurological medications* Opiates* Myxedema (Hypothyroidism)* Hyper parathyroidism* Uremia* SLE* Scleroderma* Diabetes mellitus* Retroperitoneal hematoma* Parkinson's disease* Metabolic diseases.