A hormone responsible for normal sleep wake cycle is

Options

A. epinephrine
B. gastrin
C. melatonin
D. insulin

Explanation

To determine the hormone responsible for the normal sleep-wake cycle, we can follow these steps:

### Step 1: Understand the Question
The question asks for a hormone that regulates the sleep-wake cycle, which is also known as the circadian rhythm.

**Hint:** Focus on hormones that are known to influence sleep patterns.

### Step 2: Analyze the Options
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