Which patient who is previously unvaccinated for COVID-19 is recommended to only get one dose of an mRNA COVID-19 vaccine and does not require a primary vaccination series?
a. 3-year-old with no significant medical conditions
b.10-year-old with asthma
c.33-year-old with a moderately immunocompromising condition
d.50-year-old who is receiving active treatment for brain cancer