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Although bioink is an essential component of bioprinting technology , several challenges remain in satisfying different requirements for ideal bioink , including biocompatibility and printability based on specific biological requirements .
 machine or equipment: component; application: bioprinting; machanical property: biocompatibility; process parameter: printability
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: component, bioprinting, biocompatibility, printability 
Answer:
 machine or equipment: component; application: bioprinting; machanical property: biocompatibility; process parameter: printability