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Steroids are the organic molecule which plays an important role in the growth and development of the body. The molecular structure consists of 17 carbon which are arranged in four fused structure. It is found in plants, animals and fungi. Steroids such as cholesterol forms an integral component of the cell membrane and alter the membrane fluidity. They also acts as hormone receptor for steroidal hormones. It acts as a precursor for the biosynthesis of steroid hormones, bile acid, and vitamin D. 

So, the correct answer is option A.