6th February 2024

A 32-year-old female with chronic pancreatitis presents with a scaly-erythematous rash around the extensor aspects of her hands and knees.

A 32-year-old female with chronic pancreatitis presents with a scaly-erythematous rash around the extensor aspects of her hands and knees. This was associated with hypopigmented patches with follicular papules with central keratotic plugs. She reports associated dryness of her eyes. Her sister has noticed that she has been falling more easily at night and frequently bumps into tables and chairs when the lights are not switched on. Ocular examination revealed foamy white plaques on the conjunctiva bilaterally. 

Which of the following vitamins is responsible for the underlying condition?