Answer:
A. Seminar
Explanation:
"Health services" are related to medical care that are provided by healthcare professionals such as doctors, nurses, etc.
Prenatal is a healthcare service provided to expecting mothers or mothers who are pregnant.
Check-up is a healthcare service provided to people who want to know the general condition of their health.
Treatment is a healthcare service provided to patients with sickness or injury.
Seminar is a gathering of people due to academic reasons.
So, this makes "seminar" as the answer/exception.
