Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the number of physicians in the region with an all nurses number of 91?

### Inputs:
table_name: table, columns: ['Region', 'Physician (GP & specialist)', 'Physician : Population Ratio', 'Health Officer', 'HO : Population Ratio', 'All Nurses', 'Nurse : Population Ratio', 'Mid-wives', 'Mid Wife: Population Ratio', 'HEW*']

### Response:
SELECT MIN Physician (GP & specialist) FROM table WHERE All Nurses = 91