I believe it's antecedent. There's no commas anywhere so it shouldn't be an appositive phrase.
<h3>
Bhopal gas tragedy.</h3>
The Bhopal disaster, also referred to as the Bhopal gas tragedy, was a gas leak incident on the night of 2 - 3 December 1984 at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, India. It is considered among the world's worst industrial disasters.
The highly toxic methyl isocyanate (MIC) gas can cause death within minutes of inhalation if its concentration exceeds 21 PPM (parts per million). That was the reason for so many deaths and the crippling after effects on hundreds of thousands of survivors for decades, as per organisations.
Answer:
Madan didn't steal my pen.
Hope this helps!
--Applepi101
