Question

A patient's complaint of urinary frequency is called a

Answer 1

The answer is:  [D]:  " CC " .
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Note:   "CC" stands for "chief complaint" ; in this context.
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Choice:  [A]:  "ROS" ; which stands for "review of systems";      
     is INCORRECT ;  (since these would be more complex than what is                                          described in this very question).
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Choice:  [B]:  "PHI" ; which stands for "Protected Health Information" ; is         INCORRECT.  "PHI" is more comprehensive and  refers to refers to legal issues and procedures regarding safeguarding and disclosing an individual's (e.g. a patient/client) medical records / conditions / treatment / progress notes—and medical conditions and other personal information and test results related to the patient/client— including aspected related to the "electronic health record (EHR)"—especially as mandated under provisions of the federal HIPAA (Health Information, Portability, and Accountability Act) of 2006.
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Choice: [C]:  "PMH" ; which stands for "past medical history" ; is            
       INCORRECT.
The information given in the question:
      "A patient's complaint of urinary frequency." — would generally refer to the current complaint.  "PMH" — or "past medical history" — which could be extremely subjective and may be cursory and only recorded to the extent deemed relevant as asked by and determined by the doctor/ provider to patient/client. Note that the mention of PMH by no means implies that the patient/client NO LONGER HAS THAT CONDITION.
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Answer 2

I'm going with d- chief complaint