Among the four options given below three have similarities find the odd one out.

Influenza

The odd one out is Influenza.

Explanation:

⇒ Scurvy, Beri Beri, and Rickets are all nutritional deficiencies (Scurvy results from a deficiency of vitamin C, Beri Beri from a deficiency of thiamine, and Rickets from a deficiency of vitamin D, calcium, or phosphate).

⇒ Influenza, on the other hand, is a viral infection and not related to nutritional deficiencies.