They are used to make mucus easy to cough by making it thin
Explanation:
Mucolytics are drugs such as ambroxol, bromhexine, carbocisteine and others that are used to make mucus thin and less sticky thereby aiding the process of coughing the mucus up in respiratory condition such as chesty cough.
D- injury after birth
A congenital disorder is a medical disorder that is present at or before birth, so an injury after birth is not a congenital disorder
