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: Biochemistry
True about cardiolipin is all except 
Select and explain. 
A. Found in inner mitochondrial membrane, B. Play role in process of apoptosis, C. Is Diphosphatidyl glycerol, D. Has choline base which has labile methyl group
D: Has choline base which has labile methyl group
Answer: D: Has choline base which has labile methyl group 
Explanation: Cardiolipin (diphosphatidylglycerol) is a phospholipid present in mitochondria.  
It is formed from phosphatidylglycerol, which in turn is synthesized from CDP-diacylglycerol and glycerol 3-phosphate.
Cardiolipin, found in the inner membrane of mitochondria, has a key role in mitochondrial structure and function and is also thought to be involved in programmed cell death (apoptosis).
Cephalin: Has choline base which has labile methyl group.
 
Harper's Illustrated Biochemistry 30th edition page no 248