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: Orthopaedics
True about fat embolism -a) Petechia in the anterior chest wallb) Bradycardiac) Fat globules in urined) Occurs after 1st week of polytraumae) Thrmbocytopenia 
Select and explain. 
A. acd, B. bde, C. cde, D. ace
D: ace
Answer: D: ace 
Explanation: "Arterial blood gas analysis reveals hypoxemia and hypocapnia, with subsequent metabolic acidosis in severe pulmonary embolism. During anaesthesia, end tidal CO2 concentration may fall dramatically because of increased dead space and reduced cardiac output". _________ Anesthesia & Intensive care

Note : Fat embolism can present as pulmonary embolism when an extensive fat embolism of lung is present.