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What is Which of the following is a cardioprotective fatty acid a) Palmitic acidb) Stearic acidc) Oleic acidd) Omega-3 fatty acids and explain in detail?
Omega-3 fatty acids > 'c' i.e., Oleic acid 

Saturated fatty acids (palmitic acid and stearic acid) increase the risk of CHD.
Monounsaturated fatty acids (oleic acid) and co-3 fatty acids, both reduce the risk of CHD. However, co-3 polyunsaturated fatty acids are most cardioprotective:-

"Dietary co-3 polyunsaturated fats suppress cardiac arrhythmias, reduce serum triacylglycerols, decrease the tendency for thrombosis, lower BP, and substantially reduce the risk of cardiovascular mortality".