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It is now commonly accepted that vanadium may cause sterile abscess and aluminium may cause scar tissue , whereas titanium , zirconium , niobium and tantalum exhibit excellent biocompatibility .
 material: vanadium; machine or equipment: sterile abscess; material: aluminium; biomedical: scar tissue; material: titanium; material: zirconium; material: niobium; material: tantalum; machanical property: biocompatibility
Please list all entity words in the text that fit the category.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} 
Answer:
 material: vanadium; machine or equipment: sterile abscess; material: aluminium; biomedical: scar tissue; material: titanium; material: zirconium; material: niobium; material: tantalum; machanical property: biocompatibility