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: Anaesthesia
All of the statements about skeletal muscle relaxants are true, EXCEPT: 
Select and explain. 
A. Mivacurium is hydrolyzed by plasma cholinesterase, B. Rocuronium is largely excreted unchanged in urine, C. Pancuronium blocks the uptake of nor-epinephrine, D. Atracurium is degraded by Hoffman's elimination
B: Rocuronium is largely excreted unchanged in urine
Answer: B: Rocuronium is largely excreted unchanged in urine 
Explanation: Rocuronium does not undergo any metabolism and is excreted unchanged through bile and urine. 90% of injected dose of mivacurium is hydrolysed by pseudocholinesterase to mivacurium monoester and amino alcohol. 10% of it is excreted unchanged in urine. Pancuronium stimulates the sympathetic nervous system by inhibiting the reupake and increasing the release of catecholamines at the nerve endings and by the muscarinic receptor blockade action. Atracurium is degraded by Hoffman's elimination in addition to that by cholinesterase.