Leprosy — Classification

The clinical image of the patient's face shown above demonstrates diffuse skin thickening, multiple nodules, and prominent furrowing of the forehead and eyebrows, giving a characteristic "leonine facies." What is the most likely diagnosis?

In the WHO operational classification of leprosy, which of the following is used as the primary criterion for distinguishing paucibacillary from multibacillary disease?

A 42-year-old woman from Odisha presents with multiple ill-defined hypopigmented macules and plaques on her trunk and limbs with loss of sensation. Slit-skin smear shows 4+ acid-fast bacilli. Nerve thickening is present. She is classified as having lepromatous leprosy. What is the drug of choice for her treatment?

A 35-year-old man from rural Maharashtra presents with a single hypopigmented macule on his left forearm with loss of sensation. Slit-skin smear examination shows no acid-fast bacilli. He is diagnosed with indeterminate leprosy. What is the drug of choice for treatment?

A 32-year-old man from rural Maharashtra presents with a single hypopigmented macule on his left forearm with loss of sensation. Slit-skin smear is negative. Which feature best distinguishes tuberculoid leprosy from borderline tuberculoid leprosy?