Which of the following are characteristics of diabetes mellitus, a common disease of human beings?
1. Increase of blood sugar.
2. Appearance of sugar in urine
3. Loss of hunger
4. Lack of energy
Which of the statements given above are correct?

A. 1, 2 and 3

B. 1, 2 and 4

C. 2, 3 and 4

D. 3 and 4

Answer: Option B