Spot the mistakes in the giveti statements and correct them.
a) Alpha cells produce a hormone called testosterone.
b) Beta cells produce insulin and progesterone.

Explanation

### Step-by-Step Solution:

1. **Identify the Mistakes in the Statements:**
- The first statement claims that "Alpha cells produce a hormone called testosterone."
- The second statement claims that "Beta cells produce insulin and progesterone."

2. **Correct the First Statement:**
- The correct hormone produced by alpha cells is **glucagon**, not testosterone. Testosterone is a sex hormone produced by gonads (testes in males and ovaries in females).
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