4811
There are three types of problems : problems arising before the drug enters the body ( solubilization , stabilization and improved acceptability ) ; problems associated with the penetration and fate of the drug in the body ( absorption , barrier crossing , duration of action ) ; problems relating to the therapeutic target ( selective local delivery ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None