This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Platypilea is seen in 
Select and explain. 
A. Diaphragmatic palsy, B. Pleural effusion, C. pulmonary embolism, D. Lt atrial tumor
B: Pleural effusion
Answer: B: Pleural effusion 
Explanation: platypnea ohodeoxia is typically an ove symptom when the patient's posture changes from the supine to the upright position. .Especially when a significant pleural ef- fusion (hydrothorax) is present, the intrathoracic effusion spreads diffusely over the posterior space of the thorax in the supine position. Ref Davidson 23rd edition pg 619