Final answer:
Darwin's tubercle refers to a congenital nodule on the ear's helix. It's unrelated to tuberculoid leprosy, which involves Mycobacterium leprae, or tuberculosis caused by Mycobacterium tuberculosis, manifesting in lung tubercles and Ghon complexes.
Step-by-step explanation:
Darwin's tubercle indicates D. A congenital, painless nodule at the helix of the ear. In the context of a skin biopsy involving tuberculoid leprosy, the microorganism that would be found is Mycobacterium leprae. When considering the formation and rupture of tubercles in the lungs, a different mycobacterium is involved, which is Mycobacterium tuberculosis. This organism can lead to the chronic symptoms of tuberculosis and the formation of Ghon complexes, which are calcified healed tubercles visible in chest radiographs.