The condition wherein there is no enough food in a region to feed people is known as

The correct option is famine.

To understand why this is the correct answer, let's look at the definitions of each option provided:
1. Famine: This is a widespread scarcity of food, caused by several factors including war, inflation, crop failure, population imbalance, or government policies. This phenomenon is usually accompanied or followed by regional malnutrition, starvation, epidemic, and increased mortality. Therefore, the condition wherein there is not enough food in a region to feed its people is precisely defined as a famine.
2. Drought: This is a prolonged period of abnormally low rainfall, leading to a shortage of water. While a drought can lead to a famine by causing crop failure, the lack of water itself is a drought, not the lack of food.
3. Monsoon: This is a seasonal prevailing wind in the region of South and Southeast Asia, blowing from the southwest between May and September and bringing rain (the wet monsoon), or from the northeast between October and April (the dry monsoon).
4. Thunderstorm: This is a transient storm of heavy rain accompanied by lightning and thunder.

Thus, the specific term for a severe shortage of food in a region is famine.