Solution

In the case of Mohammad Allahabad Khan v. Mohammmed Ismail Khan, the Allahabad High Court held that the Doctrine of Acknowledgment is a part of substantive Muslim law of inheritance and not merely a rule of evidence. The Doctrine of Acknowledgment is a principle under Islamic law that allows an illegitimate child to inherit from its father if the father acknowledges the child as his own. The acknowledgment can be made explicitly or impliedly through conduct, and it creates a legal relationship between the father and the child. The court in this case observed that the Doctrine of Acknowledgment is not merely a rule of evidence, as it creates a legal relationship between the father and the child, and has a significant impact on the rights of the child to inherit from the father. Therefore, the Doctrine of Acknowledgment is an essential part of the substantive Muslim law of inheritance. Option (A) S A Hussain v. Rajamma and option (B) Mohd. Amin v. Vakil Ahmad are not relevant to the Doctrine of Acknowledgment under Muslim law. Option (D) Habibur Rehman v. Altaf Ali is also a case related to Muslim law of inheritance, but it is not related to the Doctrine of Acknowledgment.