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
[{'content': 'All decrease CO2 absorption in circuit except \nSelect and explain. \nA. Resistance in circuit, B. Flow, C. Dead Space, D. Tidal Volume', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Resistance in circuit 3 times of minute volumeQ volumeQ " v:shapes="_x0000_s1027">CO2 absorbers increase circuit resistanceQ. Granule size is a compromise between high resistance & high absorptive surface area of small granules and lower resistance to gas & lesser absorptive surface area of larger granules (d/t channeling)Q Flow rate &tidal volume should not exceed the air space between absorbent granules; this will decrease CO2 absorption.Q The pa of tidal volume that does not undergo alveolar ventilation is referred as dead space; so any increase in dead space decreases CO2 absorption.', 'role': 'assistant'}]