Final answer:
The information of least importance when obtaining the medical history on a new patient is favorite hobbies. Family medical history, current medications, and allergies are all important factors to consider.
Step-by-step explanation:
The information of least importance when obtaining the medical history on a new patient is d) Favorite hobbies. This is because favorite hobbies do not typically impact a person's medical history and are not relevant to their current health or potential medical conditions. On the other hand, family medical history, current medications, and allergies are all important factors to consider when assessing a patient's health and potential risks.