GRAMMAR GRAMMAR !! Responsibleis always an adjective, never a noun.Tobe responsible for (doing) somethingcan mean to have done something wrong• Who is responsible for this mess?It can also mean to have to do or take care of something• You're responsible for taking people's coats. • Our department is responsible for marketing.The person/company etc responsibleis the person etc who has done something wrong• Police are determined to catch the man responsible (NOT the responsible).Aresponsibleperson, or someone who isresponsible, is sensible• Children should be in the care of a responsible adult. • He's a very responsible young man.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.