Which of the following pairs are correctly matched?
1. Anorexia : Sleep disorder
2. Insomnia : Eating disorder
3. Dyspnoea : Shortness of breath
4. Anosmia : Partial or full loss of smell

Select the correct answer using the codes given below.

Evaluating the medical pairs: Anorexia is an eating disorder characterized by restriction of food intake (not sleep), and Insomnia is a sleep disorder (not eating). Dyspnoea refers to difficulty or shortness of breath (Pair 3 is correct), and Anosmia is the total or partial loss of the sense of smell (Pair 4 is correct). Thus, only 3 and 4 are correctly matched.