**Question:** Voice produced by false vocal cord due to non-functioning of true cords is seen in

A. Vocal cord paralysis
B. Hyperthyroidism
C. Hypothyroidism
D. Chronic bronchitis

**Core Concept:** The true vocal cords are responsible for producing the primary vocal sound, while the false vocal cords serve as a resonance chamber. In the context of this question, if the true vocal cords are not functioning correctly, the resulting voice quality would be influenced by the presence of the false vocal cords.

**Why the Correct Answer is Right:** A vocal cord paralysis (option A) is the correct answer because it involves a condition where one or both of the true vocal cords cease to function, leading to an altered voice quality due to the involvement of the false vocal cords as a resonance chamber.

**Why Each Wrong Option is Incorrect:**

B. Hyperthyroidism (option B) is a condition characterized by an overactive thyroid gland, which may not directly affect the function of the true vocal cords. Although thyroid hormones play a role in vocal cord function, hyperthyroidism is not directly related to the altered voice produced by the false vocal cords.

C. Hypothyroidism (option C) is the opposite of hyperthyroidism, characterized by an underactive thyroid gland. Similar to hyperthyroidism, hypothyroidism may indirectly affect vocal cord function but does not directly cause the altered voice produced by the false vocal cords.

D. Chronic bronchitis (option D) is a respiratory condition characterized by inflammation of the airways in the lungs, which does not directly relate to the function of the true vocal cords or the involvement of the false vocal cords in producing an altered voice.

**Clinical Pearl:**

In cases of altered voice due to true vocal cord dysfunction, thorough clinical examination and further investigations may be required to identify the underlying cause and initiate appropriate management. Vocal cord paralysis, thyroid disorders, and respiratory conditions are among the potential causes to consider. In addition to examining the vocal cords, additional tests like laryngoscopy, thyroid function tests, and pulmonary function tests may be necessary to confirm the diagnosis and guide management.