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this extensor mechanism is composed chiefly of the quadriceps femoris ( rectus femoris , vastus lateralis , vastus intermedius , vastus medialis ) , quadriceps tendon , patella , and patellar tendon .
 component whole: mechanism, patella
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  mechanism, patella 
Answer:
 component whole: mechanism, patella