This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
Which of the following is neither metabolized by liver nor by kidney 
Select and explain. 
A. Atracurium, B. Pancuronium, C. Vecuronium, D. Rocuronium
A: Atracurium
Answer: A: Atracurium 
Explanation: Atracurium * two separate processes for metabolism - Ester Hydrolysis (2/3)-catalyzed by nonspecific esterases - Hofmann Elimination (1/3)-spontaneous nonenzymatic chemical breakdown occurs at physiological pH and temperature