The correct option is A Monascus purpureus
Trichoderma polysporum is the fungus used for commercial production of Cyclosporin A, which is used as an immunosuppressive agent in organ-transplant patients.
Saccharomyces cerevisiae, also known as baker's yeast is the most common yeast species in bread and in sourdoughs.
Aspergillus niger is one of the most important fungi used to produce extracellular (food) enzymes and citric acid.
Red yeast rice is a Chinese fermented rice product that improves blood circulation by decreasing cholesterol and triglyceride levels in humans as it produces blood-cholesterol lowering agents called statins.
Monascus purpureus is a fungus used in the production of red yeast rice.
So the correct answer is option D.