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: Surgery
[{'content': 'In a patient of Bronchial Asthma, silent chest signifies? \nSelect and explain. \nA. Good prognosis, B. Bad prognosis, C. Grave prognosis, D. Not a prognostic sign', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Grave prognosis REF: Practitioner: Volume 230, Page 185, Allergy: principles & practice: Volume 1 page 517 "The silent chest, where air entry is so poor that few sounds are produced, is a grave prognostic sign" Cyanosis, an altered consciousness, gasping respirations, and a silent chest in a dyspneic patient all herald grave illness. These events occur in less than 1% of cases', 'role': 'assistant'}]