The correct option is C Cholesterol in blood
The use of garlic as an aid for improving health is older than its use as a food. In ancient times, the garlic bulb was considered a common treatment for deafness, dropsy (abnormal accumulation of fluid in the body), intestinal parasites, leprosy, respiratory illnesses and loss of appetite.
Today, garlic is more commonly used as a food or food seasoning. A study that used dried garlic powder over 8 to 12 weeks showed significant reductions in total cholesterol, LDL cholesterol and triglycerides, but the effect didn't last beyond six months of treatment, suggesting that garlic has only a short-term effect on cholesterol.
So, garlic is useful in reducing cholesterol in blood and not urea or serum in blood or blood in reproductive organs.
So, the correct answer is 'Cholesterol in blood'