Why is the first item in some drop-down lists a blank?

Which of the following phrases best describes the past history?

a. Any reference to a specific illness the patient has experienced regardless of the time period b. Childhood illnesses, previous surgeries or procedures, injuries, and prescribed medications or treatments the patient has undergone c. The measures taken by the patient to alleviate or change the symptoms of the current medical problem d. Childhood experiences with healthcare providers

What are the requirements for a detailed type single organ system physical examination of the cardiovascular system?

A. Documentation of at least six elements identified by a bullet in shaded borders B. Documentation of at least nine elements identified by a bullet whether in a shaded or unshaded border C. Documentation of at least twelve elements identified by a bullet whether in a shaded or unshaded border D. Documentation of five to seven organ systems or body areas