This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Medicine
Which is NOT a feature of pleural effusion? 
Select and explain. 
A. Horizontal fluid level, B. Low lung volume, C. Muffled hea sound, D. Decreased chest movements
A: Horizontal fluid level
Answer: A: Horizontal fluid level 
Explanation: Features of Pleural Effusion - 1. Blunting of costophrenic angle 2. Low lung volumes 3. | chest movement 4. Dullness on percussion 5. Ellis curve Muffled Hea sound is characteristic feature of - Pericardial effusion | Can associated with pleural effusion Horizontal fluid level is characterised feature of Hydropneumothorax