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Otherwise challenging to create via conventional pharmaceutical techniques , 3D printing technologies have been explored for the fabrication of multi-drug loaded dosage forms to reduce pill burden and improve patient adherence .
 concept or principle: pharmaceutical techniques; enabling technology: 3D printing technologies; manufacturing process: fabrication; concept or principle: multi-drug loaded dosage; concept or principle: pill burden; concept or principle: patient adherence
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: pharmaceutical techniques, 3D printing technologies, fabrication, multi-drug loaded dosage, pill burden, patient adherence 
Answer:
 concept or principle: pharmaceutical techniques; enabling technology: 3D printing technologies; manufacturing process: fabrication; concept or principle: multi-drug loaded dosage; concept or principle: pill burden; concept or principle: patient adherence