His father has had similar episodes. What is the most likely dx?

An otherwise healthy 13yo boy presents with recurrent episodes of facial and tongue swelling
and abdominal pain. His father has had similar episodes. What is the most likely dx?
a. C1 esterase deficiency
b. HIV
c. Mumps
d. Sarcoidosis
e. Sjogren’s syndrome

Q. 1. What is the key?
Q. 2. What is the name of this condition? Q. 3. Why it is not acquired?

Ans. 1. The key is A. C1 esterase inhibitor deficiency.
Ans. 2. Hereditary angioedema.
Ans. 3. Acquired angeoedema usually manifest after the age of 40 yrs