A. Gastrointestinal tract
B. Nasal mucosa
C. Lung
D. Skin
Correct Answer: Gastrointestinal tract ✔
Last Updated: February 07, 2020
A. Gastrointestinal tract
B. Nasal mucosa
C. Lung
D. Skin
Correct Answer: Gastrointestinal tract ✔
Last Updated: February 07, 2020