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': 'Intrapleural Pressure during forceful expiration is \nSelect and explain. \nA. - 20 mm Hg, B. + 5 mm Hg, C. - 5 mm Hg, D. + 20 mm Hg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Intrapleural Pressure: (ITP) / Intrathoracic Pressure\nIt is the pressure within pleural space (space between visceral and parietal pleura)\n\nAt beginning of inspiration = -2.5 mm Hg / - 5 cm H2O\nAt end of inspiration = - 6.0 mm Hg / - 10 cm H2O\nAt end of expiration = - 2.5 mm Hg / - 5 cm H2O\nForceful inspiration = - 20 mm Hg\nForceful expiration = + 20 to\xa0 + 30 mm Hg', 'role': 'assistant'}]