This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Regarding rheumatic pleural effusion. what is not true 
Select and explain. 
A. PH less than 7.2, B. LDH greater than 700, C. Glucose greater than 50, D. ADH level >50mg/dl
C: Glucose greater than 50
Answer: C: Glucose greater than 50 
Explanation: Pleural fluid studies The typical "rheumatoid effusion" is a sterile exudative fluid with low pH (<7.3), low glucose (<60 mg. dL-1) and elevated lactate dehydrogenase (may be >700 IU. Rheumatoid factor is often present in pleural fluid, and may be higher than serum levels. Ref Davidson edition23rd pg 530