The reason why most patients suffering from recurrent herpes labialis rarely give a history of having acute form of the herpetic gingivastomatitis is because_____________?

The reason why most patients suffering from recurrent herpes labialis rarely give a history of having acute form of the herpetic gingivastomatitis is because_____________?

A. Etiological agents differ
B. The acute form occurs only inversely immuno compromised individuals
C. The primary infection was subclinical
D. The patient has received antibodies during intrauterine life and the antibodies have persisted