Answer:
Bile emulsifies 
Explanation:
(breaks into small particles)  lipids (fats), which aids in the mechanical digestion of fats.   The pancreas and gland cells of the small intestine secrete digestive  enzymes that chemically break down complex food molecules into simpler ones.
 
        
             
        
        
        
Thyroid nodule produces the hormones that change your voice
        
             
        
        
        
The answer is letter a because that is very true if you get hooked on that it can and most likely will lead to death.