On five floors, one above the other live five doctors. The Endocrinologist is equally friendly to all and lives on the third floor. The Nephrologist has to go up to meet his Neurologist friend above whose floor lives the Dermatologist. The Nephrologist has to go up as many floors up to meet Dermatologist as many floors Neurologist has to go down to meet Ophthalmologist. Which of the following statements is true?