I am assuming the one giving you a problem is "agency"?
Caption)
1. With respect to the vehicle involved in the incident referred to in the complaint:

Underline Answer
(a)Do you admit ownership? Yes No
(b)Do you admit operation? Yes No
(c)Do you admit agency? Yes No
(d)Do you admit control? Yes No
(e)Do you admit the date and place? Yes No

4. If you do not admit agency and the owner was not also the operator, state: (a)
the circumstances under which the vehicle came into the possession of the operator; (b)
the purpose for which the vehicle was being used; and (c) its destination.

http://www.genmay.com/showthread.php?t=58939
AGENCY
Definition: Agency is generally defined as the relationship that arises when one person (the principal) manifests an intention that another person (the agent) shall act on his behalf. The agency relationship is consensual in nature. Unlike a contract, however, no consideration is required to create the relationship.

Creation:
1. Agency by Agreement (creating actual authority).
2. Apparent Agency (creating authority by holding another out as your agent when in fact they are not).
3. Agency by Ratification (accepting the benefits of what somebody did for you when they had no authority to act on your behalf.
4. Statute.
Duties Between Principal And Agent
Duties of Agent to Principal:
1. Loyalty: undivided loyalty, no self-dealing or no secret profits, no conflict of interest.
2. Obedience: follow lawful directions
3. Reasonable Care: reasonable care
4. Notice: notify principal of matters that affect principal and relationship.
5. Accounting: account for money and property of principal
Duties of Principal to Agent:
1. Compensation
2. Reimbursement
3. Contractual
4. Cooperation
Contractual Liability:

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Note added at 12 mins (2018-03-15 23:49:39 GMT)
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https://www.proz.com/kudoz/english_to_spanish/law_general/20...
GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase: admit agency
Spanish translation: admite representatividad /intervención / instrumentalidad en el hecho

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Note added at 12 mins (2018-03-15 23:50:18 GMT)
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Agency:

law legal relationship: a legal relationship involving a person the principal and another who acts for the person the agent, or the area of the law concerned with such relationships
The case hinges on a question of agency.

http://encarta.msn.com/dictionary_/agency.html

1. The condition of being in action; operation.
2. The means or mode of acting; instrumentality.