Coconut oil mixed with baking soda is the odd one out among the given options.

Explanation:
Here is a detailed explanation of why option A is the odd one out:

1. Coconut oil mixed with baking soda:
- Coconut oil is a natural oil extracted from the meat of mature coconuts. It has various health benefits and is often used in cooking, skincare, and haircare.
- Baking soda, also known as sodium bicarbonate, is a white crystalline powder commonly used as a baking ingredient, cleaning agent, and for various medicinal purposes.
- Mixing coconut oil with baking soda creates a natural exfoliating scrub that can be used for skincare purposes, such as removing dead skin cells and unclogging pores.

2. Paste of turmeric and milk:
- Turmeric is a yellow spice commonly used in cooking and has several health benefits. It contains an active compound called curcumin, which has anti-inflammatory and antioxidant properties.
- Milk is a nutrient-rich liquid produced by mammals and is commonly consumed as a beverage or used in cooking.
- The paste of turmeric and milk is often used in traditional medicine and skincare routines as it is believed to have skin brightening and anti-inflammatory effects.

3. Paste of baking soda and cream:
- Baking soda has already been explained above.
- Cream refers to a dairy product that is made by skimming the fat from milk. It is commonly used as a cooking ingredient, as well as for skincare and beauty purposes.
- A paste of baking soda and cream is often used as a natural remedy for various skin conditions, such as sunburns, rashes, and acne.

4. Coconut oil mixed with indigo:
- Coconut oil has already been explained above.
- Indigo is a natural dye derived from the leaves of the indigo plant. It is commonly used for coloring fabrics and hair.
- Mixing coconut oil with indigo is a common practice in haircare, especially for those who want to achieve a natural dark or black hair color.

In conclusion, option A (coconut oil mixed with baking soda) is the odd one out because it involves a combination of two ingredients that are primarily used for skincare purposes, while the other options involve ingredients used for various purposes, such as cooking, haircare, and coloring.

A