You are presented with the question "what are soluble in blood?" and the following answer choices: 
- viruses
 - lipids
 - glucose
 - Solutions
 - red blood cells
 - an ion
 - white blood cells
 - liquid

Now knowing that steroid hormones are made of lipids, such as phospholipids and cholesterol and steroid hormones are soluble in blood, choose the best answer.


 

  lipids       