This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
[{'content': 'TLC is: \nSelect and explain. \nA. 4.2 lt, B. 3lt, C. 5lt, D. 6lt', 'role': 'user'}, {'content': 'Answer: D \nExplanation: TLC: the volume of air left in the lung at the end of maximal inspiration. TLC= TV+IRv+ERV+Rv Ref: G K Pal textbook of Practical physiology 4th edition, page number: 158,159', 'role': 'assistant'}]