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
In a patient of Bronchial Asthma, silent chest signifies? 
Select and explain. 
A. Good prognosis, B. Bad prognosis, C. Grave prognosis, D. Not a prognostic sign
C: Grave prognosis
Answer: C: Grave prognosis 
Explanation: 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