This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Lipids, Subject name: Biochemistry
Which of the following phospholipid is predominantly found in the inner mitochondrial membrane? 
Select and explain. 
A. Cardiolipin, B. Cephalin, C. Lecithin, D. Sphingomyelin
A: Cardiolipin
Answer: A: Cardiolipin 
Explanation: Cardiolipin: Diphosphatidyl glycerol i.e. 2 phosphatidic acid moieties attached to glycerol. Found in inner mitochondrial membrane. Physiological role: Increases the efficiency of the oxidative phosphorylation by acting as proton trap. Involved in signalling of apoptosis (programmed cell death). Anticoagulant Pathological role: Bah syndrome - defective biosynthesis of Cardiolipin. Antiphospholipid syndrome thrombotic condition leading to aboion. Anti-cardiolipin antibodies are found.