Name the microbes that help production of the following products commercially :
(a) Statin
(b) Citric acid
( c) Penicillin
(d) Butyric acid

Explanation

To answer the question regarding the microbes that help in the commercial production of specific products, we will identify each product and the corresponding microorganism responsible for its production.

### Step-by-Step Solution:

1. **Statin**:
- Statins are cholesterol-lowering agents that are commercially produced using the bacterium **Monascus purpureus**. This microorganism is known for its ability to produce statins through fermentation processes.

2. **Citric Acid**:
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