Describe the stereotypical mad scientist ?

A mad scientist is generally called "mad"/ "insane", because of unsettling characteristics, and the dangerous/questionable experiments they run and work on. For example, the creator of frankenstein, from 1818, was said to be a mad scientist, this isnt like the green monster, its the person who sticked different things to different people and tried to run electricity through it to act as a heart, also just to see if he could create a human like creature. THATS a maad scientist, but the stereotype mad scientist according to wikipedia, is white male, aging, crooked teeth, messy hair, lab coat, green glowing liquid filled test tube, goggles, gloves, and striking a dramatic pose while cackling evilly

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an

Explanation:

When using an article in English, a simple rule is followed. For the words that start with a consonant sound, the article "a" is used while "an"before is applied before words that begin with the vowel sound.

In the case of MBBS, we will realize that the letter "m" starts with a vowel sound when it is said in isolation. Therefore, we will make use of "an".