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: Physiology
[{'content': 'True statement about latch bridge mechanism \nSelect and explain. \nA. Binding of tropomyosin to actin, B. Sustained contraction of smooth muscle with low consumption of energy, C. Variability of tension at particular length, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Latch bridge mechanism is seen in smooth muscle. In smooth muscle, even after depolarisation of muscle cross bridge continue to cling for sometime leading to sustained contraction of smooth muscle.', 'role': 'assistant'}]