Answer the following question given this paragraph: 

The thymus is found behind the sternum. The thymus produces hormones referred to as thymosins, which contribute to the development of the immune response in infants. Adipose tissue, or fat tissue, produces the hormone leptin in response to food intake. Leptin produces a feeling of satiety after eating, reducing the urge for further eating.


Q: What produces hormones referred to as thymosins, which contribute to the development of the immune response in infants?

 Choices:

- pancreas

- heart

- receptors

- thymus

A:
thymus
